What's the status of BoundingCapsule?

Is it known to be working, cos I've seen a few posts about it not being fully implemented.

Bounding volumes (like BoundingBox, BoundingCapsule,…) are jME objects, and directly related or used by jME Physics. If you are using jME's collision detection, then I believe that you are correct in saying the BoundingCapsule is not fully implemented for bounding volume collision results.

If you are using a physics engine (i.e. jME Physics with ODE), then you can use a capsule collision geometry.