There a few improvement that I would like to see implemented. I don’t think these would be too difficult:
Inviting:
I would like to be able to right click in chat and have the option to invite/join a group. I would also be able to open the guild page and be able to right click and invite/join a group.
Guild:
I would like to see a separate color for dots on the mini-map for guild-mates like gold rather than green when ungrouped. This would allow for better coordination in moving a guild around to accomplish a set task .