elfin ember
It might be even more controversial in full honesty. Anyways, it would be a cool addition to have a delay until the keys are nulled out. The problem is eg if you keep one key fully pressed, and you rapidly bottom out the opposite key you the time is too short to come to a full stop. If the newly pressed key is still activated for multiple milliseconds that would imo eliminate it.
Though again I guess that could make it easier to counter Strafe and can be considered more cheating.