Quite commonly I'll modify in-memory a VI I don't have an SCC lock on. It's actually convenient because for changes I don't intend to retain, I never lock the file - when I close out the IDE (or File > Save All) I can tell it to save everything. It saves everything it can, and then the prompt comes back up for files it couldn't save. I then hit Don't Save and that's that
Yeah, I did think about that after I posted and the way you describe - in an atomic sequence - is really the way I meant. I think scripting might be the only way to mass-lock or mass-unlock, though.