Retain length of handles when modifying curves and length of path when moving anchor points.
I'd love an option to retain the length of a handle for an anchor point. It would be nice to keep the curvature equal on both sides of an anchor point. There are many times I would have liked this option to create symmetrical graphics.
Similarly, I'd also like the option to retain the length of a path when moving an anchor point. Sometimes I use lines/paths as arms of characters. If I need to change the position of an arm there ends up being a lot of guess work modifying the path.