Ah, I've found a workaround that will allow me to do what I said I wanted to do earlier. Still working on the hubs, though. I'm having trouble making the banners, because of SRB2s crappy and limited palette... also, I'm having worries about Circuit/Race because although they are very different, they're under the same mode (Race), so I don't know how I'll fix that. The only way would be to edit the source to have a different value for circuit, and have the circuit maps use that value, but I wouldn't know how, so... that's something for another time.
So far:
Match: Red
Race: Blue
Circuit: Black + White
Tag: Orange
Co-op: Green
CTF: ? (HELP PLEASE)
Once I finish the banners, I can finish the hubs, and finish the waiting rooms... etc. etc.