Okay, as long as we don't have an actual feature for this, I'd like to ask whether this could work (and to what extent):
Make a weapon with a really high rate of fire and particle velocity, practically zero energy use and some pre-defined cone of fire (5-10 degrees would probably do it) that does no damage but spews a lot of low-memory, translucent, very fast disappearing particles on the surface.
That should make for some kind of a makeshift spotlight that can be activated. Technically it should create a shimmering light effect where the "projectiles" hit, but I really can't think how realistic the effect would be. Also, the projectiles themselves would probably cast some kind of lighting to the environment.
Basically the effect would be the more realistic the more there would be these particles, but obviously the amount of particles would be limited by the performance of the PC. I do not know how much would be required for a truly realistic enough effect, but it may be worth a try.
In fact, I may have to try and create this for the sole purpose of flying in BtRL's Emmental asteroid...
