Team-colored special effects!!!
Not for explosions (wherefore?) but for groundflashes at least (because some textures must be not team-colored).
If somebody somewhen and somewhere will make someway something like this, don't forget to tell me.
You can do it with Lua very easily, for simple stuff. If you need true CEG behaviors, you're best off asking jK to explain how LUPS can be used for what you want.