undo button & letting me say when I'm done writing

I wish I could write whatever I want, undoing any mistakes, and explicitly say when I'm done. It would feel a lot more natural and akin to using a pencil and eraser that way vs getting blasted with "Wrong!" and given the answer the moment my hesitation makes me mess up. Plus, if I try to draw a second stroke after my "wrong" one, it immediately skips me to the next question, which feels weird to me.