Behaviors such as tendency to eat anything all the time can be selected for, but I don't know that anyone does so with BPs; quite the opposite, from what I read. I and some others do it with lizard feeding colubrids, and the effects can be seen in just a couple generations. "Assist" feeding troublesome hatchlings selects for the need for assist feeding. In my own experience and in that of breeders I've mentioned this to, snakes that are problematic feeders when they're younger birth problematic feeding offspring at a much higher rate.
I'm sure the same is the case to some extent for parameter tolerance (temps, RH), but there are probably other more important factors at play with BPs such as unidentified/undiagnosed asymptomatic pathogens.