I would say not implemented yet (My copy is up to date) and I don't know how high on a list of changes it would be for Leo. I might contact him via the support channel and see if he is actually aware of it.
I would honestly call it a bit of a weird one to have a requirement for a sign on either alt or az, given all azimuth are positive numbers (Unlike Dec, where I can see there is a sign in the FITS header) and negative alt numbers would not be useful for any target to be imaged.
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