Last time I contacted the author, I didn't have much luck, think my request got drowned out. I also generally suck at C# still, so I wasn't able to do much myself so far... however, I have managed to figure out enough to control the SuperCharacterController with PlayMaker in a cheap way: If I set the key values to public, PlayMaker can set them with Set Property!
That, in fact, was basically what I wanted, which I might have explained poorly. I wanted to have similar features to what's listed under "Character" in PlayMaker such as grounding checks and collision flags, but instead modifying the properties of the Super Character Controller script. I didn't actually mean recreate the entire script as a PlayMaker script, just knockoffs of the built in Character Controller actions that modify the Super Character Controller instead.
Anyhow, I basically got what I wanted handled in a weird way messing with it recently, but if it's possible for you to whip up some custom actions that could let me move it, check collisions, and so on, that'd be really cool!