Alt+UpArrow vs. Backspace

In the file dialogs for maya 2011 the file windows done recognize Alt+UpArrow for jumping up a level in your directory. it's using backspace, which is fine. But, in all of the other explorer windows you can use Alt+UpArrow, it's just a simple lacking function, but it's something that was removed with the move to Qt. A minor complaint, but it's something im adding to my list of erks.