Step undo for brush strokes
Normally when you draw a stroke and hit undo the whole stroke is undone.
Hold down control and draw a stroke and each step layed down by the brush is put into the undo buffer.
Now when you undo you can undo the stroke in small steps. Nice for when you are about to draw something and you know there’s a chance you will overshoot, just back it off a few steps with undo for brush strokes.