Ok,
Here is my personal opinion. (Just me and does not represent anyone but me).
2011-1) - 3 piece crossmember - NO - While the intent is fine it opens the door to some adjustments and non uniformities that we do not know about. The only way to be close is to spec a certain part number. Then we need to validate that part number and manage and track it.
Seems better to stay stock. Pulling the crossmember is not that hard IMHO.
2011-2) Larger jack pad - YES - fine with me. I see now drawbacks.
2011-3) 924 Carrara GT flares. I see it from one standpoint that it may allow more cars to partcipate. I know of at least one car locally with these rear flares and it is shame to not let it run. I also see the that potential gains are slight. - So mixed, but lean torward no.
2011-4) Lexan rear qtr windows. - NO. Lexan should not be used on these cars at all. We allow the windshield for "safety" and lower replacement costs, but guys are thinking about it for weight. No.. better to keep it stock. The plasic you get home depot maybe clear, but what will happen in crash. The stock glass was designed for automotive use so lets just leave it at that. If you need a fresh air duct use the passenger's door window.
So No, Yes, Maybe, No. Is my personal view. We series directors have not agreed on these yet and the comment period is still open.
(remember no all propoals are my idea, it is just my job to present them).