Although the forum is now entering read-only mode as Jdance mentions, we’re certainly up for prioritizing group system changes if they’re popularly requested. One hope we have with reducing fragmentation in the community sites (e.g. moving from forum to the subreddit and Steam discussions) is that it will be easier to coordinate community interests / goals — for example if group reworks gain traction.
One suggestion we received recently is temporary membership of in-game groups to help with offline members. When joining a group the default rank would be temporary, lost when logging out. (to assist with point 1.)