CAS: Feedback score is an available Sort type for Member statistics in CAS 2.3.0 Beta 1, so I am going to mark this as implemented. NOTE: This has been pushed into CAS 2.2.32 for those that don't want to wait for CAS 2.3.0.
This allows you to create member stats based on CAS Feedback score.
Note: If I do release another CAS 2.2.x version, I will add this into that as well as it only takes a few seconds to implement (simple 2 lines of code in 2 functions in the CAS Listener). This has been implemented in CAS 2.2.23
For those of you that don't mind PHP customizations, it's a skill level 0 edit.
Add lines 320 and line 330 as shown. That will make the sort type available to the XF Member Statistics function in the Admin CP.