Again though this really seems like a non-issue.
A) People tend to want to get pugs over with as soon as possible, meaning the chances of one waiting around for cds or not breaking cc are extremely low
B) If a group does want to do that, why should anyone tell them they can't? They're essentially paying for lower stress runs with their own time, and time is the most valuable currency in any mmo.
I don't mind the idea of giving rewards for timing a run, but they should be cosmetic like the og challenge modes. Certainly no one should be losing their key over it.