Devs, sort out portal, it's ded!

Why can't I make a 1v1 or 4vs4 or whatever number I feel like as a custom TDM experience? I don't even want progression, just disallow progression for those types of experiences... When you host a local experience, you don't get progression at all, so the code is already implemented, I just want a simple TDM match with a couple friends now and then, sort it out ffs