When attacking a ship with a flamethrower success or failure is determined by if the other ship managed to get their chemical spray up in time. An observant gunner can see what components have the white goop on them and target other components until the chem spray wears off. However for ships like the spire, mobula and squid which have some vital components hidden behind ship geometry gunners don't get much visual feedback on if their flame attack was blocked by chem spray.
I suggest there be an additional component to the hit marker to inform the gunner if the hit managed to ignite a fire stack. That way our pyromaniac population (you know who you are) can scan the enemy ship for unchemed components and put the flame where it is most effective. It would also help new players understand what weapons do additional fire damage.
It would also be nice to see smoke or flame rising off the hull or balloon to indicate it is taking flame damage, but I understand that would be a significant amount of work.