What? Why no scripted fires ?
Well. How about car explosions would create fires that only could be put out by atleast 2 firemen and one medic on scene?
These kinds of systems are not easy to make, and take time to script. They likely want to focus on getting the initial release out first before adding massive features or changes like that.
That would require us to 1) keep resetting the vehicle's HP all the time to keep it burning 2) the script would need to detect when a car is low hp 3) the script would need a % based chance as to when the fire will stay.
This could be nice script, yes, but it could also backfire performance wise.
I believe someone found a successful way to do this a long time ago in 0.3zr2, however I'm not sure how well it would work in 0.4, nor am I aware of the performance of it. If 0.4 supports fire objects without causing damage, you *might* be able to float one over the vehicle's hood. Stormeus could probably give better insight into something like this, though, as he is involved in the mod's development itself.