IIRC, Patrick did also say something about making a 10S Monster instead of 12S (after he'd confirmed he was working on a design), because he said the braking voltage spikes might be simply too high on 12S. He also made a post somewhere listing some possible spec options, but I can't find it at the moment. It was along the lines of an 8S 300A controller, a 10S 200A, and a few other versions I think.