Regarding shadowplay and recording:
"Q: What is ShadowPlay?
A: NVIDIA GeForce ShadowPlay is a feature in GeForce Experience that lets you capture or stream high-quality in-game footage with minimal performance impact. ShadowPlay has four modes: Shadow Mode, Manual Mode, Shadow + Manual combined mode and and Twitch mode. Shadow Mode records up to the last 20 minutes of your game play. Manual mode lets you toggle recording on and off like a video recorder. Combined mode (default) lets you use both features at the same time. Twitch mode lets you stream to Twitch so others can watch your game."
"Q: How long can I record for?
A: On Windows 8, ShadowPlay can record up to 20 minutes of video in Shadow Mode. There is no recording limit in Manual Mode."
You turn on manual and it records all the time right? You can toggle it anytime you want. I don't understand your comment "so you can't save a normally unrecorded moment". Turn it on in manual and it records every moment, so I'm confused (at least until your drive is full...LOL).