I was told by Mordrehel that accidental FF while aiming for the xeno coming out of the vent can get you banned because there is no time to investigate.Fighting after the round ends and generating combat logs. The exception is Marines and aliens fighting, or fighting against spawned Antags (Russian attack teams, W-Y Assassins, etc). End of Round Grief (EORG) is an IMMEDIATE 3 hour ban with no warnings.
But let's be fair, FF happens while fighting, you can even shoot marines who are out of your view.
Benefits (How this will benefit the server and game as a whole):
Noone will feel tricked because trying to do something explicitly allowed and still banned. Grief notes have a lot of disadvantages as far as I know.
Details (Description of how you think this would work, the benefits, etc):
Having a totally inflexible policy of banning without warning or investigation plus encouraging marines to take the risk of triggering it will create a pissed off player sooner or later. You have the policy for good reasons. So the exceptions must go.