It would be great to have a Audio visualizer so you can see where the loud areas in the game session are.
Like when you screams in a horror game and you have to find it, it'll be easy to see where the sound has spiked and easily clip it.
Book marks are fine but I often find my self forgetting to bookmark it when I'm immersed in the game. So I have go through hours of footage to see where those happened.
And APM stats also not useful for this.