On some of my sub-assemblies that are frequently reused in larger ones, I would like to reuse AND modify previously established joints/mates.
Options I would prefer to see:
Disabled: sub-assembly is a rigid part
Enable: some -> all joint/mates local to the sub are used (moving parts with this enabled would not change the original file)
Override: some -> all joint/mates local to the sub are either modified or disabled as if no mate existed previously (again, no change to the original file)