Feature Request: add Yesterday to quick commands and maybe make a user configurable quick command list

[Ymetro]

Hi, thank you for publishing this plugin which greatly improved my Joplin's user experience.

I'd like to suggest adding "Yesterday" to the list of Quick Commands as "/yesterday" as it would greatly help writing a (personal) diary.
I have looked at the .jpl file and found "Today" and "Tomorrow" but it is beyond my comprehension, or lacking audacity, how to add it neatly between all the other code.

Could you add it or help me add it into that file? Or is there an additional customization file possible?

On another note, I would like to see, that when a user would enable the "Enable quick command for quick inputs" option, a list would appear, wherein there are two columns in which on the left side it is filled with the already programmed quick-command labels and on the right side the associated Markdown of that command you can edit, so a user could fine tune their wishes, and an option to add new quick commands.
I am no programmer, so I like to know if this hard or feasible to implement.