Hi IC, there isn't any convenient way to generate isocurves in MoI v2, but there has been a new method specifically for that added in to v3, it was introduced in the Jul-20 v3 beta, some info on it here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=5285.1

So right now that's only in a beta release version and not in the trial version currently.

- Michael