U probably have talked about or it's on the list but i'll say some that are interesting:
•Remap button
•Gold bars
•Wikipedia of gears, vanity's
•More detailed info's about procs/pets
•Possibility to preview other class gears/vanity's on auc
•"buy all" button to tokens vendor's
•Add inventory/stash slots to some vendors, like valley and expedition camp(there are more also)
I'll think in more and throw here