Screencasting in 1080p from a retina display without scaling, possible or not?
After much searching and toying with various programs I finally found one that did exactly what I wanted.

http://www.madrau.com/

Now I have this fancy menu that I can use to quickly change my screen resolution.



I record my screen at 1280 x 720 HiDPi (720p). It puts black bars on the top and bottom of my screen, but for recording purposes that's totally fine. You can also record at 1920 x 1080 if you need 1080p, but I find that text gets really tiny at that resolution; with 720p I only need to zoom my text editor in slightly.