How about this thing where you hold your mouse over the map name for 3 seconds, it will show a picture of what the map looks like just in case there is a name change.
There should be an 'Are you sure you want to go to lobby?' button when pressed because all my work is gone when i accidentally leave and I haven't saved my work.
should be portals, a different colour that can transport you to another level. this would be great for medium world bosses that dont have enough space to put the code. another idea was the ability to make your world locked and so no one can join without ur permission.
 "Frantic Frigates"){kind=icon}
 "Gib Fest Multiplayer"){kind=icon}
 "Everybody Edits"){kind=icon}
 "Neon Race"){kind=icon}
 "CycloManiacs 2"){kind=icon}
 "Dibbles: For The Greater Good"){kind=icon}
 "Zombie Trailer Park"){kind=icon}