Seriously, I can't even fathom purposely mutilating an animal. Pulling the wings off a fly--even as a child, I couldn't do it.
I'm at a loss on the split lips (some interesting ideas above), but I do believe plenty of bass have their jaws broken--unintentionally, ignorantly--by the anglers who catch them. If you hold a bass up horizontally by the lip, without also supporting the body--well, that jaw isn't meant to hold a load like that.
I've never used one, so forgive my ignorance: what about these boga grip things? Could they cause any damage?