As I understand auto painting, once started, then stopped, a start again starts from the beginning, all over again.
My suggestion is for a "pause" button so that if started again, it will simply continue from where it stopped, not re-art from beginning again.
I know if during a pause if I change something, a pause may not be possible; that is OK....but if that can be done too, all the better.
This would make auto paint interruption possible.
Yes some nice effects can be done by auto painting on a new layer for each start; so a restart after a pause, done on a new layer, would also be helpful to be able to do.