To get a jet with napalm strike just make a "normal" mig have the napalm strike's weapon instead of it's normal one.
But as for the crash it could be that it doesn't have transport inside the kindof but more likely you have the mig acting like a b52 or something no doors may also be a problem but I doubt that's the crash...
lol okay make it like a "normal" mig, just simply copy the chinajetMig code letter for letter, then just change the weapon so that it is the napalm striker's weapon - so that it is just like a normal unit instead of doing all of the technical stuff.
So then whats the point of making a napalm strike?
Unless you want to make it like a "real" napalm blast in which case everything - just about - is going to be in a blaze of hell... which should look pretty cool but it may cut into the graphics card a bit.
I would guess that Originally the MiG's DIDN'T have the firestorm ability.. then EA cut this ability and added it to the migs. It's some fun really and quite useful if you know what your doing (plus.. it's FREE).