So my question is how does this "lean" affect the Type-R specifically, does low roll center promote lean, or does high roll center promote lean?
Its the distance between the center of gravity and the roll center. The larger the distance the more leverage = more lean. Lower roll center is going to be a greater distance from the CG. Good example would be off road cars. High CG, low RC. Motorcycles are the opposite. Low CG and very high RC, thats why they lean into a corner.
I use this software
http://www.rctech.net/forum/electric...alculator.html
For me having roll centers within a mm front to rear seams to work out the best for me.