I think split resistance is almost as important as disease resistance. I don't know if the trait is linked in any way to any of the traits you listed. I also don't worry too much about it myself. A knife easily trims the "scab" of a split area off before eating. But I have noticed that outside of people really into tomatoes, that is the primary "off putting" thing about heirlooms or otherwise great tomatoes.
Also there is a gene in fruit I read about. It is a specific gene for green shoulders. Increases the sugar and nutrient balance in the fruit many times over. (sorry I forget the name of the gene)
That I think would be useful in making sure the fruit are as frost resistant as the plants. It also is helpful in maintaining flavor late in the fall.
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Scott
AKA The Redbaron
"Permaculture is a philosophy of working with, rather than against nature; of protracted & thoughtful observation rather than protracted & thoughtless labour; & of looking at plants & animals in all their functions, rather than treating any area as a single-product system."
Bill Mollison
co-founder of permaculture
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