I think most people who criticize the SRA haven't actually driven one and just go off what the reviews say. The only time SRA is a problem is, like Richard said, over uneven surfaces.
That said, can the control blade IRS handle the power the guys at the track are going to be putting down, not cost thousands more, and not have a significant weight penalty? If so, no reason to not get some (marginally) better handling out of the car and stop the reviewers from jumping on it about "ancient tech". Then there's always going to route of making it an option, which would make everyone happy.
I think too big of a deal is made out of the IRS thing though. I mean, my superduty out handles most cars I've driven and it has two solid axles and leaf springs all the way around. :shrug: