I would love to create one for cs2d where people could submit, download, review, etc community content for cs2d. I originally created such a platform for assaultcube, so it would be easy to make a fork for cs2d. That would be my way to give something back to this great game. And integrating Steam Workshop would be a real hassle because of the game being made in a Blitz language.
If wanted I can post a video of the assaultcube platform, so you can get a general idea how it would be.