I had to chuckle at the similar thread on kingsnake and the mention of pied feeding habits. I've been keeping the ringer belly possible possible hets for years but they have eaten so poorly I'm only just now starting to get some up to breeding size to put it to the test. I have little doubt that is a useful marker if not 100% reliable. Estimates I've read are from 60 - 80% of hets having it, way higher than in non het pieds. I've followed the trait through generations and am raising up a very well marketed girl who's last pied ancestor was her great great grandfather.
Another one I read about was some het hypos shedding clear like hypos. When I picked up my original het hypo male (who didn't shed clear) the breeder was cleaning cages and sure enough he had some hets that shed clear. I noticed my het was particularly bright (reduced dark pigment in the light pattern areas) and half his offspring where noticeably brighter than the other half. I kept the only bright female and sure enough she has now proven het hypo. Not much of a sample size though and not breeding the other's out too doesn't help to prove anything.
I've long heard of het stripes being brighter and 'strippy". Have never been sure about what exactly the pattern to look for is though.
Another rumor I don't have even a little experience with is VPI axanthic hets tending to be black back pattern.
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