i've read that some san pedros will set a 2nd crop without caprification - sometimes.  can anyone expound on this?  what varieties will do this?  is there a subtype of dessert king that will do this? 

Chris DiPaola of (former) BelleClare Nursery, did mention this
about one on his fig list. I think that the spray was some kind
of gibberellic acid:

[ I have never tried it] 

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#100 Perkounis-Large purple/black, red center from island of Mykonos. Grows well in hot climates.
Originally a Class II San Pedro Type, producing large brebas only. Main crop was only
females so none of the figs would develop. After experimenting with growth stimulant
sprays containing a hormone to inducing specialty flower to become large for exhibition,
Belleclare sprayed this into the eye of the female fig at halfway point of 28 day cycle and
seven days later. As a result, a main crop was produced because the spray mimicked the
male hormones. This occurred several years in a row and then Bellclare stopped for three
years in a row and during that time, the tree adapted and produces self-fertile main crops.
The hormone spray came from edible Landscaping, Afton, Virginia.
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