I think you have this backwards.
OS X supports previews of pictures, (jpg, PSD) in quicklook and Finder. You should request to Apple that they incorporate FLA and SWF support.
Otherwise it's like asking a tire company to make your car go faster.
No, Quick Look is a plug-in architecture that allows developers to add previews for their proprietary file format. Apple doesn't have proprietary file format information, obviously.
Apple has some included with the OS, but the rest are added by the developer.