...
But regardless, you should always see the correct global balance in the GUI.
Yes, I can see the total balance but not in detail, i.e. the amounts of the change addr are not displayed in the gui.
Say a user imports some vanity addresses: 1customer1xxxxxxxxx, 1customer2xxxxxxxxx, 1customer3xxxxxxxxx, etc and for some reason he has to send a partial amount back to a customer, than he needs to see the remaining (partial) balance in the client (gui). For this purpose, it would be useful to get the change amount back to the source address.
I also think that it would be very useful to see the balance of the change addr in the gui (it could be marked in some way for a better distinction).