Please make the tab key work in vendor sell/order windows

When you have a bunch of items to sell or orders to place, it's a total pain in the ass to have to keep going back and forth to the mouse between the quantity and price fields. It's not just the going back and forth, it's having to click in a tiny little box on your screen. This is bad enough that it's even a "pain point" for me. And it should be an easy change, too. The tab key works in the login screen, why not here?