No - 2 straight edges only. I'll have to check if Dimensions can handle 3 references. Everything so far is only 1 or 2.
Yes, please. It will get lost in the pile otherwise.
I've been hearing that DD is better for a long time, but I've never seen a detailed comparison. If there is anybody out there with experience in both TD & DD, a "better/worse, missing, etc) feature comparison would be a big help to me.