I want to have the option to purge unused, unless the unused items are on a user-generated list, or what was included in the template. Basically, a way to clean up a file by purging, but not get rid of our office standard families that just haven't been utilized yet.
When you start with a template file, there are a lot of families we put in for potential use, like wall types. I don't want to have to manually uncheck them from the purge unused dialog box every time I'm cleaning up my model.