Currently moving object vertices is a nightmare if you're trying to maintain their current x or y axis, or move them by a few 'pixels', as:
(1) axis/angle (45°) restricted movement (e.g. holding CTRL) is not supported, and
(2) keyboard arrow keys do not move the selected vertices (instead they pan the window view)
Another nice to have would be to allow easy adding of vertices e.g. ctrl+click on a segment to add a point, rather than having to select segment vertices and pressing 'add vertex'.