There are some brands of TP who come with self-dissolving cardboard-rolls, so you just toss them in the toiled and poof! they're gone. But sadly that doesn't come with shotgun sounds.I can answer the last one with some passion lol
I always flick the empty cardboard-roll off the holder and let it fall cos due to the very small and almost fully tiled toilet room, it sounds exactly like a shotgun shell hitting the ground! ( at least to the 9 y.o. inside me it does)
And it's soo freaking cool!
I just have to do it every time
Than I just reload the new roll onto the holder.