What is broken that I see this fixing? My desire to build, maintain and race a car with the ruleset and cars I think are the best fit for me - for a SCCA National Championship. Yes, I can go National racing in Prod, GT, SM, SRF, etc...but those classes don't interest me as much. I like to upgrade - but not to the tune of Prod, so IT is perfect for me.
And your IT vehicle, with a minimum of 3 minor safety modifications - cell, tabs, system - is capable of contesting an SCCA National Championship - Production and Prepared. It might not be competitive, but that would be consistent with the philosophy of the ruleset and cars that you think are the best for you. "not be guaranteed the competitiveness of any car.."
I would like to compete for an SCCA National Championship in a prototype equipped with unlimited boost, full ground effects including skirts and traction control. Yes, I can go National racing in S2, CSR, DSR etc.... but those classes don't to interest me as much. I like to upgrade.
I understand the concern about fitting extra cars into an existing well-subscribed national. If your track isn't long enough to handle the additional cars in your existing race groups, I can see that you might have a problem. But if there's room on the track, then go for it.
There isn't room on the track for that mix of classes.
I don't understand the concern about the lap time differences. Yes, the slower cars in a group might get fewer laps than the faster cars (because they get lapped), but guess what? Apparently that's okay, because this routinely happens at the west coast Nationals. We have huge speed differentials, and guess what? The drivers are smart enough to handle it. Even in our REGIONALS, we run *all* of the IT classes together, including ITR. No problem. This isn't spec racing. This isn't the Runoffs. We run multiple classes together. We live with it. We even like it.
And having perused the results at SFR, it is clear why there is no problem - the slower IT classes effectively do not exist. 2 ITC cars, 2/3 ITB cars. We regularly put more ITC cars on track for a Regional than SFR's combined ITB+ITC count.
In short, the problem doesn't exist because the solution created a new problem. This is the equivalent of people saying 'we' don't have a 'problem' combining all of the Formula classes. Of course it isn't a problem! The Vees just stop showing up and instead of having 12 to 15 of them at a race, you get 3. Shoot, I could put a single ITC in a field of Grand-Am Bash'em DPs and the ITC wouldn't be a problem, but get enough ITC cars out there to have a field and their own race and it does become a problem.
So I think this whole speed differential thing is a red herring. It's not a big deal. We do it all the time out here, at both regionals and nationals. And yes, we have very full fields, with 50-60 cars on track together at pretty much every race.
And GT1 on course with GT5 use to be viewed as safe too.