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The PHD2 developer working on this feature provided me with an internal build (as pictured in the OP) which I have done some testing with.
It is still very preliminary but would benefit from widespread testing.
I have tested it with an 80mm external guide scope and with an ONAG on my 120/900 refractor. There is an improvement in guiding with multiple stars but at this stage selected stars must be approximately correlated in SNR. I also observed that selecting stars in close proximity to one another makes little if any difference over a single star, which brings into question whether OAG-equipped systems would benefit.
I suggest contacting the PHD2 developers via the PHD2 Google Group and express your interest in testing this out.
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