Is it possible to import only "selected" meshes from a file? [Modo]

I have Modo lxo file in which I have low/highpoly and collider meshes. It is getting very slow every time I save my .lxo file because unity imports also highpoly meshes, which I don’t need in unity.

So is there an option from where I could select which meshes should be imported?

Not really. It would be nice if Captain Obvious would have lived up to his namesake, and said where to get the scripts in question:
http://forums.luxology.com/discussion/topic.aspx?id=66465

Fortunately, it’s easy to drag an item to a new LXO, and export that.