Oh you, I was thinking of writing a concept up for lighter+bug spray, possibly making a texture for it, then asking for someone to model and code it.
Basically the normal fire does the usual short ranged fire burst you'd expect and altfire makes you rip the cap off, ignite it and throwing the can which spins in a flaming whirl, burning everything indiscriminately for a few seconds, depending how much ammo was left in the can.
That way it would fulfill the same role as molotov cocktails, setting up a "firewall", while not being restricted to that use alone.
The weight would be 1, same damage as the flamer but very short afterburn and you won't ignite yourself like with a flamer (so firebugs have something for enemies that are up close. Like those damn bugs) so this would be an option to fill up the last block.
Also yes, do want.