Probably has already been suggested but I'd figured I'd put in a post anyways. I just like to set things on fire: monsters, animals, friends, entire forests for appearently no reason. And I though, "Why isn't there something that lets me burn things from afar with ease?" Crazy that there isn't I know but here's my suggestion.
So I figure it should be in 2 parts like most things in IC2. A weapon item and a pack item. Both filled via the canner.
There were options I thought about for fuel with and without other mods.
Without mods
Extracted biofuel making bio-diesel
Maciated firecharges which is then crafted with biofuel
Maciated netherack which is then crafted with biofuel
Or any combination of each
With mods
oil or extracted oil to make diesel
oil, water, and maciated netherack to make napalm
Flamethrower
Possible crafting formulas could be
or
pipe | cf sprayer
Flamethrower Pack 
pipe
Functionality would normally act like a wand of fire from thaumcraft with 2 alterative mode of fire one acting like a fire charge which uses a bit more fuel and one acting like a ghast shot which uses up even more. I would love you long time if this was added.