Yes, you can make your own folder of a gamemode with it's own description.txt and gamemode.txt!
This is server sided, so you'll need a server to do this.
This is host only, but you can make it SA by
$Pref::Server::AllowGamemodesForSAs.
You can request current add-ons that are enabled and it will automatically add them to the enable queue.
You can add or remove the add-ons.
There's even a preview of what the description and the gamemode.txt will look like!
You can even have a simple environment (Sorry the advanced mode part is a bit confusing)
You can also make your own minigame with many options to choose from!
Type /GMMGui in the server to open it! Enjoy!
Script_GMMakerI use this for Blocknet because linux doesn't seem to execute all of them until I used this add-on.