diff --git a/action/action_type.py b/action/action_type.py
index c6b85c8..5fedb74 100644
--- a/action/action_type.py
+++ b/action/action_type.py
@@ -2,6 +2,7 @@
 
 
 class ActionType(Enum):
-    ModifiedKeyAction = 1
+    ModKeyAction = 1
     ModTapAction = 2
     LayerOnAction = 3
+    LayerModAction = 4
diff --git a/action/layer_mod_action.py b/action/layer_mod_action.py
new file mode 100644
index 0000000..450e003
--- /dev/null
+++ b/action/layer_mod_action.py
@@ -0,0 +1,33 @@
+from typing import Tuple
+
+from evdev.events import KeyEvent
+
+import host
+import mapper
+from action.action_type import ActionType
+from action.mod_key_action import ModKeyAction
+from log import debug
+
+
+class LayerModAction:
+    type: ActionType
+    layer: int
+    modifiers: Tuple[int, ...]
+
+    def __init__(self, layer, *modifiers):
+        self.type = ActionType.LayerOnAction
+        self.layer = layer
+        self.modifiers = modifiers
+
+    def handle(self, ui, e, config, *args):
+        debug('-- handling layer mod action --')
+        for m in self.modifiers:
+            host.write_code(ui, m, e.value)
+        if e.value == KeyEvent.key_down:
+            mapper.enable_layer(self.layer, self, config)
+        else:
+            mapper.disable_layer(ui, self.layer, config)
+
+    def handle_layer_key(self, ui, key, e, *args):
+        debug('-- handling LM layer key --')
+        ModKeyAction(key, *self.modifiers).handle(ui, e)
diff --git a/action/layer_on_action.py b/action/layer_on_action.py
index c117926..c0d04fc 100644
--- a/action/layer_on_action.py
+++ b/action/layer_on_action.py
@@ -13,9 +13,9 @@ def __init__(self, layer):
         self.type = ActionType.LayerOnAction
         self.layer = layer
 
-    def handle(self, _, e, *args):
+    def handle(self, ui, e, config, *args):
         debug('-- handling layer on action --')
         if e.value == KeyEvent.key_up:
-            mapper.enable_layer(self.layer)
+            mapper.enable_layer(self.layer, self, config)
         else:
-            mapper.disable_layer(self.layer)
+            mapper.disable_layer(ui, self.layer, config)
diff --git a/action/modified_key_action.py b/action/mod_key_action.py
similarity index 84%
rename from action/modified_key_action.py
rename to action/mod_key_action.py
index 50f40e0..9f9c993 100644
--- a/action/modified_key_action.py
+++ b/action/mod_key_action.py
@@ -4,20 +4,21 @@
 
 import host
 from action.action_type import ActionType
+from log import debug
 
 
-class ModifiedKeyAction:
+class ModKeyAction:
     type: ActionType
     key: int
     modifiers: Tuple[int, ...]
 
     def __init__(self, key, *modifiers):
-        self.type = ActionType.ModifiedKeyAction
+        self.type = ActionType.ModKeyAction
         self.modifiers = modifiers
         self.key = key
 
     def handle(self, ui, e, *args):
-        debug('-- handling modified key action --')
+        debug('-- handling mod key action --')
         if e.value == KeyEvent.key_down:
             for m in self.modifiers:
                 host.write_code(ui, m, e.value)
diff --git a/example/config.py b/example/config.py
index 0453d31..9d3ad66 100644
--- a/example/config.py
+++ b/example/config.py
@@ -1,13 +1,12 @@
 from layout import *
 from key import *
-T______ = KC_TRANSPARENT
 
 physical_layout = laptop
 
 keymaps = [
     [
         KC_ESC , KC_F1  , KC_F2  , KC_F3  , KC_F4  , KC_F5  , KC_F6  , KC_F7  , KC_F8  , KC_F9  , KC_F10 , KC_F11 , KC_F12 , KC_PSCR, KC_INS , KC_DEL ,
-        KC_GRV , KC_2   , KC_1   , KC_3   , KC_4   , KC_5   , KC_6   , KC_7   , KC_8   , KC_9   , KC_0   , KC_MINS, KC_EQL ,          KC_BSPC,
+        KC_GRV , KC_1   , KC_2   , KC_3   , KC_4   , KC_5   , KC_6   , KC_7   , KC_8   , KC_9   , KC_0   , KC_MINS, KC_EQL ,          KC_BSPC,
         KC_TAB ,          KC_Q   , KC_W   , KC_E   , KC_R   , KC_T   , KC_Y   , KC_U   , KC_I   , KC_O   , KC_P   , KC_LBRC, KC_RBRC, KC_BSLS,
         KC_CAPS,          KC_A   , KC_S   , KC_D   , KC_F   , KC_G   , KC_H   , KC_J   , KC_K   , KC_L   , KC_SCLN, KC_QUOT, KC_ENT ,
         KC_LSFT, KC_Z   , KC_X   , KC_C   , KC_V   , KC_B   , KC_N   , KC_M   , KC_COMM, KC_DOT , KC_SLSH, KC_RSFT,                   KC_UP  ,
@@ -19,7 +18,7 @@
         T______,          T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______,
         T______,          T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______,
         T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______, T______,                   T______,
-        T______, T______, T______,                   T______,                   T______, T______, T______,                   T______, T______, T______,
+        T______, T______, T______,          T______,                            T______, T______, T______,                   T______, T______, T______,
     ]
 ]
 
diff --git a/key.py b/key.py
index a5f463e..fd178b0 100644
--- a/key.py
+++ b/key.py
@@ -1,8 +1,9 @@
 from evdev.ecodes import *
 
+from action.layer_mod_action import LayerModAction
 from action.layer_on_action import LayerOnAction
+from action.mod_key_action import ModKeyAction
 from action.mod_tap_action import ModTapAction
-from action.modified_key_action import ModifiedKeyAction
 
 # special keys
 
@@ -525,75 +526,75 @@
 
 # modifier key actions
 def MK(key, modifiers):
-    return ModifiedKeyAction(key, modifiers)
+    return ModKeyAction(key, modifiers)
 
 
 def LCTL(key):
-    return ModifiedKeyAction(key, KC_LCTL)
+    return ModKeyAction(key, KC_LCTL)
 
 
 def LSFT(key):
-    return ModifiedKeyAction(key, KC_LSFT)
+    return ModKeyAction(key, KC_LSFT)
 
 
 def LALT(key):
-    return ModifiedKeyAction(key, KC_LALT)
+    return ModKeyAction(key, KC_LALT)
 
 
 def LGUI(key):
-    return ModifiedKeyAction(key, KC_LGUI)
+    return ModKeyAction(key, KC_LGUI)
 
 
 def RCTL(key):
-    return ModifiedKeyAction(key, KC_RCTL)
+    return ModKeyAction(key, KC_RCTL)
 
 
 def RSFT(key):
-    return ModifiedKeyAction(key, KC_RSFT)
+    return ModKeyAction(key, KC_RSFT)
 
 
 def RALT(key):
-    return ModifiedKeyAction(key, KC_RALT)
+    return ModKeyAction(key, KC_RALT)
 
 
 def RGUI(key):
-    return ModifiedKeyAction(key, KC_RGUI)
+    return ModKeyAction(key, KC_RGUI)
 
 
 def SGUI(key):
-    return ModifiedKeyAction(key, KC_LSFT, KC_LGUI)
+    return ModKeyAction(key, KC_LSFT, KC_LGUI)
 
 
 def LCA(key):
-    return ModifiedKeyAction(key, KC_LCTL, KC_LALT)
+    return ModKeyAction(key, KC_LCTL, KC_LALT)
 
 
 def LSA(key):
-    return ModifiedKeyAction(key, KC_LSFT, KC_LALT)
+    return ModKeyAction(key, KC_LSFT, KC_LALT)
 
 
 def RSA(key):
-    return ModifiedKeyAction(key, KC_RSFT, KC_RALT)
+    return ModKeyAction(key, KC_RSFT, KC_RALT)
 
 
 def RCS(key):
-    return ModifiedKeyAction(key, KC_RCTL, KC_RSFT)
+    return ModKeyAction(key, KC_RCTL, KC_RSFT)
 
 
 def LCAG(key):
-    return ModifiedKeyAction(key, KC_LCTL, KC_LALT, KC_LGUI)
+    return ModKeyAction(key, KC_LCTL, KC_LALT, KC_LGUI)
 
 
 def MEH(key):
-    return ModifiedKeyAction(key, KC_LCTL, KC_LSHIFT, KC_LALT)
+    return ModKeyAction(key, KC_LCTL, KC_LSHIFT, KC_LALT)
 
 
 def HYPR(key):
-    return ModifiedKeyAction(key, KC_LCTL, KC_LSHIFT, KC_LALT, KC_LGUI)
+    return ModKeyAction(key, KC_LCTL, KC_LSHIFT, KC_LALT, KC_LGUI)
 
 
-KC_MEH = ModifiedKeyAction(None, KC_LCTL, KC_LSHIFT, KC_LALT)
-KC_HYPR = ModifiedKeyAction(None, KC_LCTL, KC_LSHIFT, KC_LALT, KC_LGUI)
+KC_MEH = ModKeyAction(None, KC_LCTL, KC_LSHIFT, KC_LALT)
+KC_HYPR = ModKeyAction(None, KC_LCTL, KC_LSHIFT, KC_LALT, KC_LGUI)
 
 C = LCTL
 S = LSFT
@@ -700,3 +701,7 @@ def HYPR_T(key):
 
 def MO(layer):
     return LayerOnAction(layer)
+
+
+def LM(layer, *modifiers):
+    return LayerModAction(layer, *modifiers)
diff --git a/layer.py b/layer.py
new file mode 100644
index 0000000..2496fe6
--- /dev/null
+++ b/layer.py
@@ -0,0 +1,10 @@
+from typing import List
+
+
+class Layer:
+    keymap: List[int]
+    activator: object
+
+    def __init__(self, keymap, activator):
+        self.keymap = keymap
+        self.activator = activator
diff --git a/mapper.py b/mapper.py
index 1c30fcb..3d59985 100644
--- a/mapper.py
+++ b/mapper.py
@@ -1,5 +1,6 @@
 import importlib
 import importlib.util
+from typing import List
 
 import click
 from evdev import UInput, ecodes
@@ -8,11 +9,12 @@
 import host
 import key
 import keyboard
+from layer import Layer
 from log import debug
 
-last_press_timestamps = []
-active_layers = []
-layers_keys_pressed = []
+last_press_timestamps: List[float] = []
+active_layers: List[Layer] = []
+layers_keys_pressed: List[List[int]] = []
 
 
 def load_config(path):
@@ -38,9 +40,9 @@ def map_device(config_path, kb_name, ui_name='kbmap'):
     global last_press_timestamps
     last_press_timestamps = [None for _ in range(len(config.physical_layout))]
     global active_layers
-    active_layers = [False for _ in range(len(config.keymaps))]
+    active_layers = [None for _ in range(len(config.keymaps))]
     # base layer is always active
-    active_layers[0] = True
+    active_layers[0] = Layer(config.keymaps[0], None)
     global layers_keys_pressed
     layers_keys_pressed = [[] for _ in range(len(active_layers))]
     for i in range(len(active_layers)):
@@ -77,7 +79,7 @@ def handle_event(e, kb, ui, config):
         key.handle(ui, e, config, pos)
     else:
         debug(f'key is mapped to key: {ecodes.KEY[key]} ({key}) at {pos}')
-        host.write_code(ui, key, e.value)
+        write_key(ui, key, e, layer_index, config)
 
     update_timestamps(pos, e)
 
@@ -115,12 +117,21 @@ def find_key(pos, config):
             return layer_key, layer_index
 
 
-def enable_layer(layer):
+def write_key(ui, key, e, layer, config):
+    global active_layers
+    active_layer = active_layers[layer]
+    if active_layer and active_layer.activator:
+        active_layer.activator.handle_layer_key(ui, key, e, config)
+    else:
+        host.write_code(ui, key, e.value)
+
+
+def enable_layer(layer, activator, config):
     global active_layers
-    active_layers[layer] = True
+    active_layers[layer] = Layer(config.keymaps[layer], activator)
 
 
-def disable_layer(layer):
+def disable_layer(ui, layer, config):
     global active_layers
-    active_layers[layer] = False
-    host.release_layer_keys(ui, self.layer, config)
+    active_layers[layer] = None
+    host.release_layer_keys(ui, layer, config)