I think quite a few of us have taken autoXreg crosses to F2 and made new autos. The F1s will be “fast” plants with 1 auto gene. The next generation should have 25% full autos. I basically pollen chucked mine twice and the result was about as crappy as expected. I was just messin around with that mostly.
I’m sure using a 100% sativa spiced things up. The F2s should be even crazier. Flash seeds seems to specialize in making long slow autos with sativas. Some take so long to finish people give up and 12/12 them assuming they weren’t autos. I might try some eventually. They might be cool outdoors for people who want a little quicker plant, but one that still gets fairly big and uses most of the season. Also for people who just love sativas and hate the long flower times.