The tiny-a** 2 pixel wide target area so many functions have. Wanna move that note up? Oh wait, you just increased the intensity. *moves cursor down* Nope, too far dawn, you just added in an extra note. *slowly has to creep the cursor up one pixel at a time* there it is. Oh wait, you moved the cursor up a pixel when you went to click and you adjusted the intensity again.
like, i spend more time hitting undo than i do actually adjusting anything because everything is so easy to miss and do something entirely different on accident.