Just trade me entire engines Dean... Then you'll have NO TURBO LAG AT ALL!!
Honestly tho, it even makes sense to me that some HUGE turbo that takes any more time than stock to spool is un-sensible for auto-x. I've heard WAY too many people complaining about stock WRX spool rate at auto-x, and I wouldn't think you'd wanna do that same thing to the STI...