If this was added, what stats would it have? My ideas are:

Primary:
+100% afterburn frequency (get hit more often by burn damage)
-33% afterburn damage
-25% max primary ammo

Secondary:
Mini crits burning targets
Flares can bounce off and hit multiple targets
-20% damage
-30% firing speed
(taunt is scorch shot taunt)

Melee:
Damage increases as you have more enemies on fire (+15% per enemy up to +90%)
-20% firing speed
-15% damage

Let me know what you think!