Hmmmmmm, I don't really think the park would keep someone on who exacerbated their problems like that, but the power itself is sound.
How about this; Have you ever read a webcomic called Girl Genius. I don't care for it, but it has a mechanic that I've always liked: Sparks. A spark is basically, from what I can tell, a dormant mad scientist. Totally normal for most of the day, a Spark super intelligence manifests as a form of temporary insanity, during which time they have an empathic understanding of machines and are able to invent some really out there stuff.
Hey son, wanna' learn how ta' make witch balls?