That is exactly what I was thinking; if the server cooperates with ZylonShield, it is completely possible for you to finish the first map, get 0 exp/gigas/etc for it, or return to room as soon as you kill the boss with a delay of course, then immediately start the new map, but the problem here is that it wouldn't have an ID unless we added it to the others.
AKA, the sector list which you select, we can't start a new map unless the map is there, because it'd have to send the planet ID.