When my MBP died I switched to a iMac 21.5 with an external monitor. It became so much easier to record Keynote presentations with the new setup. I recorded in slideshow mode fullscreen on the 21.5 while my current slide/next slide was on the external monitor.
If I get a MBA 11 then can do it the same way. If I go with a MBA 13, recording full screen becomes more complicated. I realize that this is not brain surgery and it's been figured out before. I want to simplify my workflow and it feels like going to a 16:10 screen takes me a step backward.
Yes you can. Use a utility such as SwitchRes X, Eye-Firendly, EasyRes or one of the many others to change to a 16:9 mode. Then use QuickTime (or Camtasia, I guess) or another dedicated screenrecording-app to record your screen.
[doublepost=1498636154][/doublepost]PS: Just tried out ResXtreme http://resxtreme.com - it is free, and perhaps not has user friendly as some of the others. But it works perfectly. It is running 1920x1080 (standard 16:9 HD) on my 15" MacBook Pro right now.