Ok, here are a couple of ideas I have been thinking of lately and i could see other people finding use of them also.
first, a Self Delete restricter. basically a minigame option that disables Self Delete.
second, a sniper rifle that shoots darts. Not just any kind of dart though.
basically a dart that sticks to whoever/whatever it hits and when the person presses left clikc(or maybe L) the dart explodes.
When the shooter dies, the dart "dies"
It cannot shoot another dart while one is already in place.
You could shoot a corner and as soon as someone rounds it, you could detonate it.