Similar to Maya's panel views, it would be nice to see multiple axes being viewed simultaneously in the same window. Changing things in one view would of course affect the other views simultaneously. In my opinion, this would vastly improve part placement during assembly, and would also make 3D sketches easier. See below for mockup.
http://download.autodesk.com/global/docs/maya2014/en_us/index.html?url=files/Basics_Windows_and_Edit...