Hi okapi, I would like to have that in the future, but unfortunately an offset curve on surface function is not easy to create and it is not currently available in the geometry library that I use for MoI.

So it will probably be some time before it would be possible to add it as an automatic tool.

Check out this previous thread for some discussion on it:
http://moi3d.com/forum/index.php?webtag=MOI&msg=3021.8

- Michael