Selecting for AF traits from F1-F2 generations is easy. We can easily pop hundreds of seeds in small pots and transplant to bigger pots only those that start to flower under 24 light, after a month or so we can throw away the rest.
We can manage with much less space/lights than when selecting 12/12 strains that we basicly have to grow all the way.
...Well, we have to do this with AF-strains also when the AF-trait is locked and we are selecting plants that have best high/taste.
I'm not very experienced as a breeder but thats how I do it.
That's indeed the way of selecting auto-flowing. I'm only selecting from the F2, also for the best high/taste and size