i think there sould be sominthink could "fuse" were when u light it there are sparks for the fuse an dit slowly burnes.

Diesel should do what you're looking for.

has anyone here thought about dry ice yet?

nitrogen ice is pretty much the same thing, but if we were ever to have carbon gas or just co2 without all the crazy chemistry just simple name for a gas version then it would be cool to have.

that reminds me, we should have a solid oxygen element especially since we now have kelvin it could be in the realm of possibility without all that chemistry involved. and a gas version of nitrogen, very cold had basically, that's what's been missing!

i think there should be a "glue" element. it would glue powders toguether to form rigid structures but that move, nlike solids that are anchored. i'll try to explain better:

Elements name:Glue
What it does: Glues powders and solids toguether. Non-conductor. Dissolves in water(Mabye it could result in Goo)
How could we use it: We could make rigid my moving structures, like bricks. Could be used on concrete to make solid concrete.

i hope you read this, i think this would inovate powder toy's physics. thanks

Maybe some parafin oil for lighters and airplane engines?

you want a suggestion to the periodic table is a well of ideas. see the transition metals more resistant against heat and some more powerful than nuclear weapons.