Is there a way to fully define a mate (think washers, screws, standoffs, thread inserts, or dowel pins) using only 2 mates (say, a concentric & face mate)?  In Pro/E you can select "Allow Assumptions" in the mating routine.  I don't like the look of the underdefined ( - ) icon in my assemblies before releasing and it drives me nuts in SW that I have to make a 3rd mate to make components fully defined (especially when I have loads of screws, washers, etc.)