Dragonfire Adept and all associated paraphenalia are in Dragon Magic, and also in a convenient web enhancement here:
http://www.wizards.com/default.asp?x...060912a&page=2

Entangling Exhalation is the key. It 1/2s the damage, but tacks on 1d4 rounds of the entangled condition so long as the target takes at least 1 point of damage. Flyby Breath is in one of the Dragonlance books, but is essentially just Flyby Attack with a breath weapon instead of an attack.

For a bit of additional longevity, you could throw in a low level dragon shaman in behind the warriors with draconic aura:vigor to provide some fast healing to any warriors who get too injured. Burnssississ should be able to keep everyone locked down enough that they can retreat if needed when they get hurt.