Thanks a ton Mark! I've currently got it working via Wire Parameters, constraints, and frozen positions for each control. It seems to be working pretty well, but I've gone ahead and downloaded some scripts from ScriptSpot anyways just to see how far it can go. Really appreciate the suggestions! :)
The "reactions" take place in the objects parent space, if the objects aren't parented to anything then the world is their parent. You should parent the slider to something like it's bounding box, then parent the bounding box to the head. That way the sliders parent space is the bounding box and it stops carrying about…