Requirements:
Microsoft .NET 4.5

Usage:
Set the start and stop hot keys the same as your video recording software, then set a hotkey for noting events this can be whatever you like. Personally i use Numpad0

Now when you are recording your screen and you cough, fart, sneeze or have some other event that needs editing you can simply tap numpad0 or whatever hotkey is set and it will take note.

Once your finished you can save your tags to a file and send them to your editor.