Teabone, no luck so far. I actually checked the gunspec and projectile stuff first (and repeatedly) but it's always possible I missed something.
GraPhiX, this is about the light that "flies with" the projectiles and illuminates surrounding objects, etc. Imagine if you could throw an orange dynamic light across the map and it's kind of like that. I'm 99% sure there isn't any decal use happening and I'm still looking for shaders that may be in charge of it. I've made some minor shader edits for a few things but it certainly isn't my specialty and I may be overlooking something there, too.