Its probably a bit late for extra features right now.... just in case
One of the things i'd really like more control over is the individual balance of my addresses within a wallet. It would be very useful to have the ability to view balances for individual addresses and to a limited extent, craft transactions from whichever pool of coins i'd like to spend.
I also wondered about the possibility of adding a user defined 2FA for a high security wallet. say with an e-mail of better still a bitmessage confirmation code.??
My biggest user gripe is actually much more down to earth. I find myself accidentally renaming send addresses or worse writing over the destination address. A simple 'lock field' feature for trusted addresses would be awesome.