In the last two versions of Marlin (1.1.5 and 1.1.6) there is a feature called Level_Bed_Corners. I have not investigated it very much since I don't have a C2 and am happy with MESH leveling. It is basically designed for beds that are believed to be flat (not warped) and forces the head to move to each corner where a bed level adjustment screw is located for ease at manual leveling. If someone is interested in this I have the source for 1.1.6 already modified for the R2 here: https://github.com/WheresWaldo/Marlin_for_R2 in the 'dev' branch. I would try to provide some guidance on what needs to be modified for C2 use. and provide instructions.