Regarding BitCH.
Firstly and most obviously, I wont be giving the pool wallet private keys to anyone.
It seems there are some scammers around asking for the private keys from various people to get at the BCH ... but ... obviously ... if you give a private key to someone, they also have access to your BTC wallet address forever ... yeah that would be a stupid thing to do.
Secondly, this is a BTC pool, not a BCH pool, and although I doubt theymos is correct saying that BCH is insecure and might allow others to steal your bitcoin,
I'm not having the pool wallet go anywhere near a BCH wallet any time in the near future.
Consider any BCH that you didn't control in the manner that was clearly pointed out in many places in bitcoin, in your own wallet, as gone.
If, due to some armageddon in the dark distant future, I close the pool and check if there's any BCH, well yep I guess I'll have made some BCH also, which I expect will be worthless by then anyway

No I'm not going to risk the pool's BTC wallet, so don't ask.