Up the damage on these puppies. A whole keg of nasty explosive A-team type power should do more then 8dmg. Would also make them more interesting and fun to use against monsters.
I mean, they should be a tactical option since they're there.
I'd add other types of environmental hazards too. Like oil drums, spills, weapon racks, cracks(that cause a trip save) a box of last years christmas lights.
Sure christmas lights wont hurt anyone, but who can resist the tempation of wondering whether or not they still work...