I don't think it would work too well because in all honesty, all we really breed for is color and pattern. Most standards breed more for form. The closest I can think of to what would be needed for a ball python would be the IBC(a program with show standards for betta fish, these guys are responsible for half of the tail/fin forms we know today!)

The IBC cares about symmetry, form, scales, etc. You want good fins and a good body, color is secondary as the genes controlling color and pattern are too unreliable and random! Like people have said, even the same morphs from different lines can be extremely different! Color is a funky thing, and getting to be even more specific than a morph--or even a morph line.. That would be very hard to breed for!

The form and body of the ball python generally doesn't change too much from snake to snake, except in rare birth defects and of course over/underweight snakes.. Everyone is different, but it's not quite like the obvious show dogs vs. your average mutt!

This does happen with fish, I can see it happening with lizards maybe, not so much snakes!