You are already heavily weakened from battle injuries however increasing the penalty might be a good way to avoid BI warriors. Honestly I feel like locking a player for 8 minutes in a place where you can't do anything would to more bad than good. I also don't think Leaf Zerging is as bad as you make it out to be, Sand does the same thing, it's part of the game, leaf has more players and that means it has more lowbies, however Sand is currently full of very strong players, take that as a challenge if you will, it's just how the game is right now