Add to the double tap options the ability to set the double tap to undo last change, add another gesture for three tap, which will set to redo

This would be great, even better to have other customizable shortcuts for common actions in general.

Please add an option in the settings for two finger double tap to undo last stroke.

They should totally add this!

This feature would be so useful! I agree with that.

The ability to quickly undo with a 3 finger tap or other quick gesture would be phenomenal over the buttons at the top of the screen.

Exactly What I wanted to say! The feature of erasing with one finger is useful but an undo gesture would be great

when we use second double tap, return it to a previous state .
I think is is so convince for everyone!

Undo the last action on pressing with two fingers

when double tapping, perform "undo" action.

Paper53 has this feature as an option, it's incredibly intuitive and would be a great addition to your application