Right now Trylon's working on some fixes for Ladder regions and the start of some basic animations (use book, open door, etc.).
No promises for a release date, but I have a version that will definitely export the textures/geometry/lights/sprites/etc. correctly.
Unfortunately soft volumes are still broken (especially with regards to sounds), but I'm hoping to fix those very soon.
If you're looking for a copy of the plugin that is stable enough for what you want, I can definitely send you a copy