Yes, that is what it should do, I think. I did start with a Rhino nurbs file with one object and that came through ... but when I used the basic solids from T-splines (like sphere and box) they did not come into MoI even though I had modified them with T-splines and then converted them back to Rhino surfaces.
Odd, I think ... but when I lose something in translation I just shrug and know that I don't understand the language.
cheers,
eric