I know how to do the midline issue. I use dimensions and formulas. A constraint would be nicer, however.
I also notice that no effort has gone into 2D sketch constraints.
The ability to create real threads has been missing even since they revamped the thread tool. When this happened, I was hoping for some real threads, but no dice. It's difficult to 3D print small, fine threads, but large, course threads are easily printable.
Times past, there was a way to propose and vote on new features. That seems to have gone away and there seem to be no user input.