I'm thinking of using a flaregun in a mod of mine, however I was at wits end trying to figure out how to make the *ffffffffffffffffffffsssssssssssssshhhhhhhhhhhhhhhhhhh* then slow fade.... part of the whole thing. Then I thought of the Fatman! Does it sound feasible to modify the Fatman for the job?
John Out.
I made a flare gun yesterday, it fires a missile launcher missile that explodes 2 secs into flight and leaves a small flame and a flickering red light in the sky. I couldn't manage the slow falling to the ground bit, so the flame stays in the exact same spot for 30 secs until it fades. I used G.E.C.K. and only opened Nifskope to extract the flame for the flare (which I used as a model attached to the light).
The things you need to do for this is to edit a Weapon, an Explosion, a Projectile and to create a Light (with a script attached to disable and remove it after a suitable duration).
Then you attach the light to the explosion (as a Placed Impact Object), the explosion to the projectile (with Alt. Trigger set for as many seconds as you would like) and then attach the projectile to the weapon.
I used the snub nosed .32 pistol, and though it looks ridiculous with the missile projectile in 3d person view it actually looks acceptable in 1st person view.