Andy,
I know you're not that naive. Matt's point is spot on. They can tell the SM folks that they can't run ITA anymore, but the Regions will scream because they're counting on those entries. They'll make up the lost revenue somehow (by raising the entry fees for everyone, most likely).
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If the regions have to raise entry fees because they loose out on double dipping Miata's (or DD IT cars, or DD SPO cars, etc), then I respectfully submit that a 'no' to this idea caused it. You have actually predicted something tangible to a rejection of the idea. And that thing is raised costs to the racers if regions loose this current or future increased revenue. No? Maybe I am over-reading it.
This is starting to feel like gang up on Andy, which I don't like, but one last point since I think I at least am at a dead end with this:
The diff allowance in SM is a reliablity enhancement. It is therefore a performance enhancement. Time and time again this have been appropriately shot down in IT, except for that stupid Olds rear brake deal. This is just ONE item, I know, but it is a big one. If SMs in IT get to replace diffs that don't last a season, can I please replace my LT77 tranny that usually breaks once a year with an easy to upgrade to R380? Please?
I don't mean to sound ticky tacky but this one item right here is a BIG deal in granting SMs the allowance to run in IT without meeting the IT ruleset. It IS a performance advantage and you would immediately shoot down, as an ITAC member, any such request for any other car. [/b]
No worries Jeff! Thick skin is a requirement in this (and any) volunteer position. You dish it, you have to take it.
The reason things like this in IT get shot down is because there are hundreads of models. In SM, there is one. Since it doesn't make a car go faster, no 'other' SM'ers had a problem with it. Is it 'fair' to everyone else, probably not...but is that 'negative' enough to not allow the crossover? Again, those standing on the principle will say no - and I respect that, I just don't agree. I THINK I am looking at this from 10,000 feet, maybe it's 6 feet under...

The diff issue is a red-herring. Only certain pockets of the country seem to have the problem. There is no one single point of failure. For every 1 that pops in a year, there are 10 that go for 3+ years. I have seen the letters, and I have seen the data. You can make these kind of allowances in a spec class.
And Ed, I am not sighing AT you. I am sighing at the thought that revisionist history is getting put out there. Opportunity to respond to the idea of a process was solicited. Yes, the station wagon issue was a change put forth but it was from a member request. Is there anyone that needs that amount of granularity? If you do, I submit you have no idea the quantity of things you will need to review.
In the end, I look at the idea and weigh the factors. The baggage SM brings to this idea is minimal IMHO. Especially for 50+ extra entries it already/could bring to some regions in a weekend. But like Jeff says, the overall preservation of the integrity of IT needs to be considered as a primary goal...is this a fatal chink in the armor? I submit no but could obviously be wrong.