The mapeditor for beta2 is currently closed. Creating maps for beta2 is a very timeconsuming task also, which is why we only have 3 maps
The Beta3 mapeditor will be open to all in some way, maybe that you can only have 1 finished map in play per player or something, this as every map draws database/diskspace resources.
Beta3 mapeditor will be much more userfriendly than the previous version, which is why it takes so long time for me to complete the mapeditor functionality