As a matter of fact, there are three coop missions for each faction. https://www.youtube.com/playlist?list=PLhuXVdlphzh3wRqM_Akwpu0Rw7H_lF6St Most, if not all, of them are essentially preconfigured skirmish matches. Nevertheless, it would be great to have speedruns of them, especially the Yuri campaign.

I'd be happy to add these once there's a run of one. I'd like to do them myself with someone (probably YoshQ) at some point.