How about a new pyro update that extends the flames and double damage. And make the flare gun shoot like an automatic shotgun. And give all of the flamethrowers a compressed air blast.
A bit overemphasized, but I am really pissed off at the range of the flames. I think the flame length should be lowered a foot or two just so that you really do have to hide instead of running in someone's face with the flames blinding and torching them. It'll also make the flare gun more useful.
I'm fine with the damage though.