[Feature request] - (Polygon Selection improvements)

[xcme]

Hello!

The Polygon Selection is a great tool and I use I a lot. But when I want to cut a complex object from a photo it needs sometimes about 150 nodes on the contour. I put them approximately and then start to align nodes more precisely. It takes me about 200 small node shifts to nicely encircle a human body on a high res photo, for example. And at some step it starts to take more and more time for each node movement. I suppose it's related to undo history and each action should be stored somewhere and the more action has been done the more time a new node movement would take.

Is it possible to improve this behavior somehow? Can I limit the number of potential undo changes for the contour editing?

And the second question, is it possible to add a new node once contour has been created?

Thank you!