I was just thinking that it seems unfair that the Selection Box (reasonably new feature) goes to sleep when you select just a linked file. Maybe I want to crop the 3D view down to just that link? That's when I realized that I happen to have a scope box around the link already. Select the Scope Box and then use Selection Box - et voila!
Yeah, I'm writing as if I didn't just go two months without so much as a by your leave...things have been...hectic, yeah. That's my story...