LPE Vision Yaw implemented?

I noticed that in the LPE Fusion bitmask, there is a box to fuse Vision Yaw. Upon further investigation, this appears to not do anything.

The LPE state vector does not include any orientation information. It simply uses the Attitude Q estimator and takes the output of that as the true orientation, heading included.

Are there plans to implement this? What was the reasoning for including this option in the bitmask?