I think i'll try to make a non scripted version configured as a regular launcher instead of a rifle.
It will lose the nice ballistic shots allowed by configuring it as a grenade launcher, but there will be no need of nearest commands and other scripts to disguise the grenade as a missile.
Though there will be no workaround for the burning of the explosion of the flash missile, it will be just a regular one.
I'll let the version as a rifle though, in case changing the fire object fixed fully the crash.
(oh and improved the btr floating line by removing some of its weigth from 23000 to 21000)