Hi Adamio,

Im not a tspline expert, but from what Ive seen its 'just' a poly to nurbs conversion with a poly modeling toolset inside rhino.
I suppose the conversion is better (ngones ?), but box modeling in rhino is very slow compared to a dedicated poly modeler.

So a simple import option would be just fine in MoI I guess, and if edges creasing is supported it would be even better.
(there are many way to define crease in sub-d poly modeling, 3dsmax can use smoothing group, modo and maya handle weightmap).