you can resize effects by changing their LOD types size's i think(it works with muzzle flares anyway) but that will resize all effects of that type - there's no way to really customize them,ie adding new textures, without lots of hex editing anyway - explosions are more complex than just the effects, and you can call lots of explosion effects simultaneously from a fuse, thats what i would use anyway - i know theres a shockwave explosion looking thing too, but its small compared to the total size of a capship