I commend SCCA for taking steps to do this. I think running the best race that will be run at the Runoffs under the lights is an awesome idea and will make for a great event! I havent spoken to anyone who was not excited by the idea.
A few things.. IMO, at least one other session will need to be run in similar conditions as who knows what will be different and we will be bunched and travelling fast.
As far as lights and NA cars with lights on... I really don't think it will change the running order very much. The cool far exceeds any potential negative effect IMO.
Most that will complain about the NA cars likely weren't coming in the first place, so not sure how much weight their opinion matters in this situation. The opinions that matter in this case should be the people who actually plan on going and competing at the event, no one else.