question about using toilet when hooked up at home

How about saying okay to use the camper toilet for pee, but not poop? And then only if really necessary - otherwise use the house facilities.

I think it would be fine to make a temporary hole-in-the-ground for guests... but make sure they don't try to take a shower or something like that!! Even too much using the sink could overflow your temporary hole. It is amazing what people will do even if told not to, when they don't fully understand the system.