Is there any way to make a 4-team assault game type where the ball spawns in a central area and teams must take it back to their base to score a point? I can't seem to figure it out, however I haven't tried any insane game type stuff. Any help is appreciated.
Capture the flag is the game type that you describe, though it uses a flag and not a ball. I like Ace's idea a lot.
You might be able to place another team's capture plate at your own base. So for example, Red team's capture plate would be at green base. Green team's capture plate would be at blue base. Blue team's capture plate would be at orange base. Orange team's capture plate would be at red base. I know it's definitely possible with two teams. It should work for 4 though.
Unless you're trying to make a gametype where other teams can defuse a bomb that's armed to stop them from scoring a point, you'd probably be better off with CTF, or even Stockpile. Otherwise, you could always try and do what Ace said, though I'm not sure if you can even have 4-team Neutral Bomb in Reach.
Alright, after further thought, taking it to your own base might be dumb. Is it possible to have 4 bases, 1 neutral bomb, and you can take the bomb to any of the 3 other bases. I dont think you can have 1 detonation point for mutiple teams, so what if I stacked them?
That works fine. It's a hell of a lot easier, because it's just simply multi team Neutral bomb. I don't think there's anything actually stopping you do it.