I came up with a few ideas, maybe one of them is good enough to be worth beeing worked on.
Debris trails - By adding some big trails to the debris parts of a ship, explosions would look a lot nicer.
I think it's more complicated to code, but optionally trails for the particles would look nice too. It should look a bit like motion blurred particles. Particle trails might look even better.
Debris glow - I'm not taling about glow maps, but something that works the same way. It's just active during the explosion of a ship. The intersections would look less bad and the whole effect would look a lot better.
Post process effects - I've absolutely no idea how complex this might be. I guess this was suggested many times before. I was just thinking about the intersection problems. A post process glow wouln't have this kind of problem.
Beams, warps, explosions and a lot of other stuff would (possibly!) look a lot better. I guess this requires a MAX Video Post-like object detection system.
I'm not really sure if Bob's material system will support this, so I'm suggesting it again.
Different sized EFF frames - Sometimes I want to create animated maps that only have some action one in a while. The rest of the time they're either black, or at least they don't have to be animated. Adding hundred 'empty' frames really isn't a good solution, but I thought about using 1*1 pixel frames instead of asking for a complex pause system. Not perfect, but good enough.