Teleport Entity?
It doesn't seem the MapEntity cursor has support for the TeleportEntity yet? They're also not displayed yet on maps that already had some.
On an other related matter, you should reintroduce the zoom function the old mapeditor had 
EDIT: I'm probably not using the latest version of the editor since DF's still busy catching up our SVN. But still, if it's not in the up to date version that'd be nice to add again (also, mini map).
Okay will do, didn't want to add them until I was sure they weren't in yet 
EDIT:
I love the way the adding walls work by the way, right clicking is nice, only suggestion is when you right click it creates a 10x10 square of wall and you have to select it to be able to make it larger, might wanna make it so when you right clicked to create one it is automatically in a selected state
EDIT2:
I'm not sure anymore if I read it in the commit logs but is the mini map back in yet?
I don't "think" mini-map is back yet. Its almost fully supported, though (not like its a hard thing to do). Even if it is there, adding an issue will remind me to confirm it. But I think I just added map snapshots, not minimaps.
For the wall thing, feel free to add an issue for it with a little more detail and I'll consider it.
I'm not very picky on issues as long as they are tagged properly. Marking an issue as WillNotFix is no harder than making a post saying it already exists.
'kay note that I'm adding these issues with my other gmail so I can fill in more tags :3
Feel free to add all 3 of those to the issue tracker.