Import CAD solids to SU and positioning textures

[gaanes]

I create my models as solids with textures in Keycreator, the import as an OBJ to SU where I can use Twilight Render (TR is much smoother to use than Kerythea which is great but seems more involved).

The only problem is the textures of the imported model may be changed in SU but not edited for position (right click on the surf, texture, then position and see the entire texture and drag it into a new position or scale.

A natively created SU model may be edited as described above. But imported models via OBJ lack the functionality of right click- texture-position. How can I get a model in with that functionality?