OK. This is the beauty of FOSS. The project has been dead upstream for a while now. It survived until it was removed from lenny.
Now me and 2 other users decided to adapt it. port it or rewrite it in gtk2.
We are having a discussion about the whole situation.
To anyone still using multi-gnome-terminal: Please share with us the features you were actually using. These are the ones more likely to be implemented and no new features will probably be added, maybe help us coding and/or testing or participate in the discussions.