Editing for Line and spline are almost done. There are small issues though so I am gonna fix them. The actual design permit that you can add extra editor handlers for new shapes in future and when you click on a shape, it will show specific to that shape the list of the points that can be dragged.
I will work to fix those issues, a help related issue (that the mapping of help do not work just right) and after this I will continue with work. So today I will just work on polish and bug fixing of just implemented code.