Maybe not camfered sides, but being able to draw on a plane/surface would be very useful.

There is all sorts of paneling/line detail/geegaws/greebles that I'd like to do that are somewhat tricky with MOI as it stands.

This model was done in Rhino by John Bear Ross, and is a tank for the CAV miniatures game.
http://www.hellionproductions.com/wolverine1.jpg

This would be killer for raised panels, quick insets, etc.