Or how about being able to render current settings, both mini game, environment and save file into custom gamemode zip file?
You could then name your gamemode.
It would be standard gamemode ZIP file, with valid colorset, save and gamemode.txt files with all settings that are set for Custom server dumped to gamemode.txt (settings for environment, minigame, etc.), current bricks dumped into save.bls, colorset to colorset.txt, etc.
This would simplify making gamemodes - if you'd need something more complex, you'd be always able to edit it out by unpacking zip and doing editing there and it'll be very easy for newbies that "just want to make that DM with their own custom map, custom skybox and few non-standard bricks".
