Well, here's on for you -- dimensioning. The simpler the better, really, but being able to find and set the exact size of an object is the only thing I've missed so far.

As an aside, I just found this this morning, and it ate my entire day! I'm in love; this is the 3d tool I've been wanting for years and had planned to write myself at some point. It thinks the way I think. Between this, sketchbook pro, and journal, I might yet give up my moleskine.