Idea: A round that explodes at/close to the target tile only.
The distance to the target coursor is measured and the round explodes after it travelled that distance. The safe part is that it does not explode if it hits anything before it traveled that distance. For better functionality, explode-on-impact could activate 2-3 tiles before the target tile.
Use: New interesting ammo that also the AI can use without trouble.
Would be enabled on blaster bomb / DPL ammo. Mostly benefits the aliens, as they can't blow themselves up anymore. The player is (mostly) intelligent enough to savely use blaster bombs. Also, the player usually sets the waypoints so that you hit the ground at the target, guaranteeing an explosion. This way, the AI gets the same effect.