It would be nice to have BMTL simulate tension, so instead of it breaking as soon as the pressure reaches a certain amount the stress spreads through the entire BMTL. Once the stress gets too much it breaks.
This way you could have a whole roof collapse at once, which is a lot more useful than seeing your roof turn to BMTL slowly.
And I just realised ive probably used the wrong acronym, but you will know what I mean
yah shrapnel sounds cool. it has a hight melting point and it spreads easy, and what ever it comes on contact to it heats up at high temp(only if pressurised like from an explosin from a gun)
I think that shrapnel should only be able to be created in squares or lines so that they all stick together like an actual piece of shrapnel. They could also break under high pressure on the weakest point.
If you implement my idea, if you pressurize inside a BMTL box, it will fail catastrophically causing lots of metal parts to fly out, and because of the high pressure, they would be moving very fast.