I think the guild halls should have a second "personal banker" on the same lines as the storage agent but would give people more storage space in their guild halls.
I would also like to see an auction house agent in guild halls. This one could only be accessed and used while in the guild hall itself
it would be kinda cool to have that, i am infact a leader of a guild and ive been waiting on this type of "test" and it would be cool to be able to add more to your g hall.
...but only if they're added, say, to some special "dungeon" section of the hall. I don't want to be in the middle of a meeting and get attacked by a bunch of lvl 30s.