I have a Problem with trolls coming onto my server and pouring buckets of lava onto my players. at one point I made it so lava could not be poured at all and instead lit the user on fire, but I want lava to see be usable on my server. Anyway the Idea I had was stopping lava buckets from being poured if another player is within a customisable range of blocks. so if I set it to 5 the player would not be able to pour lava unless I was more than 5 blocks away from them. It should also stop the player from placing lava from far above the target. so make it check to see if the lava would fall onto someone within the 5 block radius. Not sure how possible all this is, and it would probably take a fair amount of time to set up right, but this would be a very handy plugin to have around.