I imagine it will be just like booking a prepaid dining experience - you select who you're paying for from your Friends & Family list and then buy the "event" that way.
The problem I'm seeing is with the waivers and any insurance requirements. Each adult will need a way to accept the waiver themselves and letting someone else sign you up won't do that. That doesn't mean they can't do it, just that I'm not sure the mechanism is currently in MDE for that.
True, but you still have to sign a waiver to pick up your bib and I don't see them discontinuing that practice at this point.