an SMD creator is already on the way. Im still working on it, and its no where near completion, but it will be out soon.
http://spring.clan-sy.com/phpbb/viewtopic.php?t=2281
The current version is ALOT better than the one listed here, I just havnt gotten around to uploading a new one yet. I will also be making a basic frontend to help you compile a map, and mabey even compress it. But an interactive feature placer is NOT in the works, as it would simply be to hard. However, using mothers map converter, it is already possible to place features from a feature map (another picture like the metal map).