[TRANSPLANTED] Fuel Trap for Pyro gun variant

Kill it with fire! originally posted this idea, though similar ones like it have been repeatedly suggested.

Basically, the pyro uses the same ammo from his flamer to pour some oil on the ground (probably either short range with wide spread or med range with very narrow spread). Once ignited, the area covered with fuel is a deathtrap to all but pyros, who can probably pass through it albeit with quite a bit of damage. Anyone caught in the oil is immediately caught on fire and dealt significant dps. Chances are, if you aren't attached to a medic, you're dead if you get caught in the fire.

Drawbacks: Uses a lot of flamer ammo to do so. is only ignitable by the flamer (though KIWF suggested any bullet would do that), thus meaning that the Pyro has to be near the trap to set it off (AKA BALANCE).

Also, the trap couldn't immediately be used. Similar to the Demo's stickies, there is a slight delay from when the oil is sprayed and when it can be ignited.

When the pyro lays the oil, a distinct and loud sound can be heard. This is to warn players that a pyro is setting a trap.

The oil itselft is relatively noticable, albeit not rediculously so. Any half-decent player will easily spot it.

The trap burns itself out after a few seconds. Somewhere between 3 and 5 seconds.

The ignition of the trap also makes a loud and distinct noise (as well as being well visible) to prevent players from turning a corner and walking right into the trap unknowingly.

If a variant of the flamer itself (with the add-on), then the flamer could be weakened in some way to make it balanced.

Any suggestions? Thoughts? This would really validate the Pyro as the de facto ambush class, allowing a good flank to completely wreak havok. At a huge cost of ammo and totally giving away your position (as well as leaving you vulnerable momentarily), I think this variant could add a lot to TF2.