Adding my +1 vote for more pressure from C-4. I'l like it to throw less fire, too. Right now it just acts like solidified gunpowder.
If I detonate a huge block of C-4 right next to a brick wall and a block of ice, I don't expect it to turn them into a slightly warm brick wall and a lake. I expect to see some portions of them turned to snow and stone.
I support as a new element. The current C4 is very usefull as an igniter, as when it is sparked, it makes fire, which can ignite fireworks, or a missle or something.