- Subforums, especially for a games series. It's horrible to find specific threads for big ones like the Thief Series, M&M etc.
- Subforums for Offtopic and General (aka Offtopic, Games not on GoG, GoG Support, bla bla)
- Add thread more flags: Modification, Patches etc.
- Base linking ability of users on numbers of post not reputation
- Forum search
- Only positive reps/Neutralize a forme up rep
I'm not active enough to give a comment on spammers in the forums. I only can see them on the Wishlist comments. And other forums handle it the same way, at least most of the ones I know do so ;)
Be able to search posts by user. Search user post history. Hope that's clear what I mean.
Those two things would help the most, get rid of the worst problems, I think. I'm less concerned about other things that might or might not be neat.
This would facilitate more collaboration on forums that don't get a lot of views, but people rely on for information regardless.