On second thoughts I think the problem in the post you linked to is to do with the way the breeding indicator is worked out.
e.g. I have a stallion Alaskan Star whose breeding indicator shows 1m1f but he matured into a 1m3f, no big deal it's close enough. The problem here is he only won 2 races as a 2yo at 5f and 6f, this now shows him as a potential 5.5f horse.
So knowing he's really a 1m3f stallion I sent him to a mare with similar form of only one win at 5f as a 2yo but she's actually a 1m1f mare. I was hoping for a 1m2f horse to be the result.
The product of this union turns out to be a miler and the game sets his breeding indicator to 5f which would be somewhat misleading to a newer player and makes the breeding indicator fairly useless.
As it stands I would prefer to be able to edit the breeding indicator for myself as it would make a lot more sense in the breeding barn.