[Mobhack]

And those that do produce flame will also produce smoke that drifts down wind as before, thus blocking more LOS - i.e. the original effect.

As Don said above - we may look into it after a while of player use and if needed tweak wrecks to produce more "flamers" if required. It could be based on the survival chance, or flame tanks may be more likely to burn etc. or it may simply be sufficient to leave it as-is. We will see what end user feedback is over time.