..........+ 1 more suggestion ,if all enemy team left...automatic ff...
This would of course make things more simple for everyone unfamiliar with bk rulebook. Not sure how much work it is to implement or is it even worth the trouble since fountainfarm accusations leading to ban are not that common, I think.
To my point of view that rule does not work properly, I do not find any sense on allowing it and later not, depending on the situation.
Should be just yes or no, not half way.
And I also get Ronaldo's point about the sanction, should not be the same as a leaver sanction since you allow it under some circumstances.