i was thinking the idea of this gun is awesome but it can be more then just a area denial weapon

bullets shot can travel an certain distant before they explode mid air and rain down flaming bits beneath them (its a good mechanic for luring out snipers or any demomans out of their cover if timed right)

if bullets hit an object or enemy before exploding they just burst in fire but instead of making a plate of fire like the in the video fire bits stick to that object or person (for example fire sticks to the wall or doors and who ever gets in contact whit them burns i believe that was the intention of the gun but in video how it makes a plate of fire and hovers mid air looked weird)

but here is my idea the enemy who are in contact whit the fire can spread the fire to other enemy players, you know from a small fire starts a big flame just like a "FOREST FIRE"

as balancing stats i am not a specialist but i liked the low damage of the flare gun, it is a high spread low damage weapon

the primal design of the gun is awesome especially if you can reach in between the enemy team you set on fire and use your melee that crits the flaming enemy's you can go absolute cave man on them (it compliments the look perfectly)

again i love the design and i hope i didn't over explained things you already know too much, i know its been years now but i hope i see this gun in game soon, good luck and thank you