Thank you! We worked really hard on it.
1) We actually used to use deferred rendering, and one of the reasons for switching was so that MSAA would be more affordable and less error-prone. I'm a firm believer in MSAA, and I think it's required if you want really good image quality. The shader-based techniques like FXAA and MLAA are certainly a lot better than nothing and they make a still screenshot look really nice, but they're fundamentally limited by a lack of sub-pixel information and it really shows in motion. They can still be nice though when used in conjunction with MSAA in order to improve the quality further and to cover up some of the places where MSAA doesn't work as well, and there's also some shader things you can do on modern GPU's that make MSAA more effective overall.
2) I'm honestly not sure what the resolution is of a raw capture. I'll have to ask Dave, the scanner is his baby.
3) A lot.