how to scale in numbers

I sooooo wish AI would do this. I keep hoping maybe there is some way to hit enter while holding a modifier or something so that the hieght changes proportionatly when I change the width. Version 1.0 of the vector effects pluggins had a pluggin called Resize and Reposition where you could do just that. For some reason they took it out of 1.5 which has a much better 3d transformer. For now I just make a square with the one dimesion Im looking for, make it guide and scale manually till the art hits the edges. BEHOLD! As Steve Jobs introduces us the latest in desk-lamp technology!