So I did a thing....
I logged on to MerkPvp To use my favorite kit Frosty. I was killing someone near the 2nd entrance to the nether fort when my igloo appeared. In doing so, I redirected the lava down the entrance.
I LOVE FROSTY. I think the correct course of action is to edit the map accordingly, not the kit. If you must edit the kit, I suggest removing the igloo with a chance of slowness 50 or something.