for extremely small, uncommon windows of time in given games. We're talking about the waning seconds of a game where the score is a 1-goal difference 98% of the time; either on a faceoff in the attacking zone, where a team is looking for a one-timer and the defensive faceoff guy drops onto the puck, or when they've got it in a corner with the clock ticking down.
I just don't see the sense in making a rule to cover a play that accounts for an incredibly small percentage of plays (in the single digits percent-wise, if not sub-1% of total games).
Whistling it is the best option for both teams, and is already in place for that reason - lately it seems like officials are letting puck battles and attempts to freeze the puck on the boards play out longer and longer. In the final seconds of a game, I think it would be prudent to be quick on the whistle, especially when it's obvious a guy is trying to freeze it to kill time. No penalty necessary, just stop the clock.