Yes.
If an elevator is on its way down from floor 8 and a person on floor 5 wants to go down as well, the elevator will stop to pick up the person on floor 5, provided there is enough room for that player. However, if the same player from floor 8 is wanting to go down and the player from floor 5 is wanting to go up, the elevator will go down first, and then come up to pick up that player.
The elevator itself will have no restrictions. It will be the sliding doors in front of the elevator that control access. Each door can be setup to for Admins & SuperAdmins, SuperAdmins only, Mini-Game, Personal, and no restriction.
What do you mean by express mode?