Is there some way to display all of the member's groups under his name in posts? Instead of just his primary one, have it make a list of the groups he's in.
....or is there already a way to do this that I'm not aware of?
This wouldn't be too hard to do.
Have you seen this mod? http://custom.simplemachines.org/mods/index.php?mod=620
It shows all the groups in members' profiles. Perhaps you can ask the mod author in the support topic (http://www.simplemachines.org/community/index.php?topic=141200.0) if he can add support for showing multiple groups next to members' posts.
I'm actually already using that mod... asking the author is a good idea, it seems simple enough to add.
Thanks!