Good question. I suppose you could hunt those F1's and find one that doesnt auto. Then find the ones that dont auto in that offspring and BX that to the original "mom" that doesnt auto. I'd guess you could eventually run most of the ruderalis out of it if you kept doing this til you found a version that meets your expectations. I dont think you would be able to "eliminate this trait altogether" to make a cross that isnt at least "slightly" prone to have certain auto traits though. Kinda like working a line that tosses some nanners. That trait can be worked, but will always be there waiting to show when just the right conditions are given (or not given). Some speculation on my part so Im curious to see others input on this.