
I think a global DM team goes too far, and havin' all these set ups for this, that, and the other is way too convoluted. What I'm talking about is far simpler.
Let's pretend that I am an ALFA DM for NWN2.

I describe the long, uneventful journey through the underdark, pfft, yeah right, before the PCs emerge into the Moonsea region and I, as the DM, pick up the story there. And by emerge I mean, log out then back in to the new server. And by pick up there I mean, log out and log into the new server.
I go on to guide my PCs to victory, which includes the retrieval of the rod, the lynching of the Platypus King, all the while killing just 3 of 6 party members. In the end, they return to the underdark a helluva lot worse for the wear.
Notice how in the above scenario the only OOC things were logging out of one server and into the next? There was no permissions needed, no red tape to navigate. There was just fun, and death for all.
Prior to this adventure I read up on the region so that I, as a DM, could capture the flavor of the NPCs and life in this alien place above ground. I also spoke to the DMs who DM here mainly to find out if there were anything else I needed to know. This found me quite prepared to run the adventure. I would do these same things if I simply wanted to get a group together and DM an adventure in the region.
To address Zelknof's concern. My point is, in order to be a DM here in ALFA you will have needed to prove yourself as a player and a member, and then as a DM. If you're made a DM, that means you've passed all of these other tests and people trust you as a valued member of our community who has already proven themselves over time. That being said, why wouldn't you allow someone like that to DM all of ALFA?
I just don't see how someone who's been here, 3months, 6 months, a year, two years, is trusted to only spot DM. We're saying to them... Well, you can DM here, here, and here. But not over there, there, or there. That doesn't show we trust them at all. And if we don't trust them, then they shouldn't get the proverbial DM wand in the first place.
So let it be known, I'm not for any type of Team. Be it Team America, the A-Team, The Dream Team, Charlie's Angels, okay maybe them, and the Dallas Cowboys, Mavericks and Stars. But other than that, no team. There doesn't need to be one. We're all one... nevermind.