The easiest way to do character animation is to set it up in 3DS Max or Maya or similar 3D software and then import to Enliven. If you use Max or Maya, you can bring those file types (.max, .mel) directly into Enliven. If you use another 3D program, you can bring that file type into Deep Exploration, export a .rh or .vlink, and then import the .rh or .vlink into Enliven.
When you work this way, the animations you set up on the character from bones will import directly into Enliven.
No, those file types cannot be imported into Scene Builder. Scene Builder can only import obj and ase.
For instructions on doing mesh morphs in Scene Builder, refer to this page on Dev Centraland click on the "Tutorial: Exporting 3D Mesh Deformations" link at the bottom of the page.