Add a freeform point creation option to the polygon mode (split/trim/etc.)

Title isn’t worded well, but I couldn’t think of a way to describe it succinctly.

Basically, placing the first three points of the polygon tool are intuitive, then it closes and you have to create new points on the existing polygon and move them where you want.

If possible, I’d love an option to have taps outside the polygon edge automatically create a new point between the last point and the starting point.