Yeah, cancelling move now for Right mouse button. People expecting Escape key doing this, just intuitive action, but no cancelling. Right mouse button isn't intuitive, and some kind "laggy" - unit make couple of extra steps before stop.
Double click move IMHO not the best idea (already tried with UFOTTS). "Highlighted" path with final TUs (at cursor box) would be nice helper, of course this helper should be drawn after some pause, for example 300ms, just not to kill CPU with constant pathfinding. And this path should be drawn very "lightly", not to screw original graphics anyhow.