Option "skipped" does not seem to work (some roms without bracket info)

[retropiuser]

Problem description:

So I have some files that are scraped and some that are not, for example in PC9800 roms.
Example for a scraped file: Farland Story III - Angel's Tears [T-En by BTAxis v1.0].zip
Example for a file that is not found: Farland Story III - Angel's Tears [T-En by BTAxis v1.0] [Original Difficulty].zip

To differentiate all my files, I would like to have the bracket information always added for all files. Thus, in my /opt/retropie/configs/all/skyscraper/config.ini I have
#brackets="true"
unchanged. By the way, most of the options are unchanged in my config.ini. When generating a gamelist, I use the option "rom names: source name" because it's sometimes more informative and the bracket information should be added, too, right? Either from filename or source. So what I get now is a /opt/retropie/configs/all/emulationstation/gamelists/pc98/gamelist.xml with

<path>/home/pi/RetroPie/roms/pc98/Farland Story III - Angel&apos;s Tears [T-En by BTAxis v1.0].zip</path>
<name>Farland Story 3 [T-En by BTAxis v1.0]</name>

and

<path>/home/pi/RetroPie/roms/pc98/Farland Story III - Angel&apos;s Tears [T-En by BTAxis v1.0] [Original Difficulty].zip</path>
<name>Farland Story III - Angel&apos;s Tears</name>

That's the main problem: The scraped one has the bracket info added to its name, the non-scraped has not. How can I have the bracket info also added for the non-scraped one? I thought the "skipped" option might do this. Docs says "If a rom has no resources attached to it in the cache, it will be left out when generating a game list file." So if it's left out, the non-scraped ones shouldn't appear in the gamelist at all and Emulationstation should use the filename. But no matter whether I use

[main]
skipped="true"

or

[main]
skipped="false"

or

[main]
unattendSkip="true"

or

[main]
unattendSkip="false"

nothing changes. The non-scraped rom always appears in the gamelist too and the brackets are removed. What can I do about it?

Technical information

• Skyscraper version: 3.10.1
• Internet connection: LAN
• OS: RetroPie
• OS Version: 4.8.6

Edit: Sorry, I just noticed this is the wrong repo to post this. I'm using the skyscraper version by Gemba so I repost there.