Reading the errata, I was surprised to find that you can only take one action with the "attack" sub-type per round. So you can't make two single-shot attacks in a single round, only one semi-auto or regular attack. This was annoying to me, because I allowed two flamer attacks per turn in order to double its firing arc (20 degrees struck me as extremely narrow for a flamethrower).
So, new full action:
Flame Spray - Full - Attack
Doubles the firing arc of a flamethrower attack, but gives +10 to the initial AGI dodge test to avoid the flames.
Much easier.