I'm all for it, if technically doable.
Both for quickly afkling and for, like mentioned, watching cutscenes. Hell, sometimes I even risk dropping off the queue because it pops at the start of a long loading screen.
It's easy to say "if you're busy don't queue" but queues can take up to hours and anything can happen in the meantime, including a common pot break.
As long as it's made so that it's not abused (ex: can only pause for 5 mins or so max) I see no negatives with it.