Nvidia has PhysX plugins for 3D modeling programs like Maya and 3D Studio Max,so that you can use PhysX in your 3D modeling applications.
But you can also "export" PhysX assets from your 3D modeling programs.
Can Esenthel then use these PhysX assets that you exported from your 3D modeling programs ?
If so,then can you only use these assets through programming or can you also set the PhysX assets up in the Esenthel world editor or mesh/model editor ?

What kind of assets? Collision hulls?

If the modeling program can export the physX hulls as meshes you can load them into the mesh editor and create a physics body from that mesh. However there's no way to import bodies made of basic shapes (for dynamic bodies), you have to create these yourself in the mesh editor.