[whpalmer4]

Yeah, there's no way to dynamically exclude all SALs from a perspective, so you would have to regularly update the perspective, and it sounded like you didn't want to do that.

Maybe name your SAL for folder XYZ as XYZ Miscellaneous instead of XYZ : Miscellaneous? Then you could select the folder when building the perspective (not selecting the items inside it) and I think the right thing would happen if you subsequently added a project to the folder. Test it out to be sure — my Mac is offline at the moment so I can't verify that suggestion.