RPGs and grenade launchers colliding with powerlines.

Seems more like a no collision decision considering the likeliness it would actually set off a detonator.
I noticed the blackhawk minigun support didn't target me through the power lines even though I was clearly visible.

Yeah technically an RPG will rip through any small things like that, but having it deflect the shot might be a good way to balance that? As far as the grenade launcher, if it hit the tip on a power line it'd probably explode. So as long as the wires are made to look the actual size of their hitboxes, that should be OK.