Where multiple slab edges are provided in a single story RAM Concrete will apply the rigid diaphragm constraint to each one independently. That is two independent diaphragms on a single level will not be constrained to each other. Also the option to remove the rigid diaphragm constraint on a horizontal diaphragm applies to each diaphragm independently. That is if members are sloped inside of one slab edge but not another the 'Remove Rigid Diaphragm Constraint on Sloped Floor' option will only apply to those nodes inside the slab edge that has sloped members.