It's already been asked, but not answered.
Why is this in the drifting thread?
I support some of the ideas that you've made, but you basically want Forza 4 with GT5 physics. Auction house is stupid since it's simple to obtain any can in the game anyway and settings aren't that hard for people to just simply post them here. Your photography "lingo" as you put it certainly is lacking, taking shots without pausing is just beyond stupid, nothing would come out right and if you're trying to get something to look good then pausing it is common sense - on the gifs however, that would just be purely recorded game footage, with would rule out the point of HDPVRs and no gaming company wants to make things easier for the consumer. The more peripherals you need to buy the better for the companies. All they want is your money and making it so you don't need an HDPVR to record game footage potentially puts a company out of business for that market.
The only one I strongly agree with is the Free Roaming city, purely because GT5 is a DRIVING simulator, not a RACING simulator. (Read the front of the box, it even has it written there.) - The city would immensely help me with a project I'm working on just now but unfortunately I just have to make do with what I've got.
Regardless, put my name down so that if this does make it to PD or whatever, at least something from this is taken into account.