That actually would be nice, if the AP-I rounds and others could be modeled. The .50 could then have a larger chance of causing a catastrophic fire upon impact with an ememy airframe.
Heck, if the HE dmg is modeled from those big cannon, why not some love for ma duece?
Hmm...this of course would lead to the need to figure out a way to implement some sort of fire suppression system like some aircraft had.