Yeah, I had thought about playing with something like that. All in all my brother is pretty good with that kind of thing, if something is working, he won't force it.
He just has a hard time grasping the concept of how varying the amount an possibly going to far, could then lead to it going to fast an thus having a wrong outcome.
He tends to treat stuff that is variable more like a light switch as he doesn't have the capacity to understand the mechanics enough.
