Many of you may already know about this - but after almost 700 hours in the sim I didn't so I'm posting... If when watching a replay you hit the dash key [ - ] (usually after the zero on the top row of the keyboard), you will create a temporary fixed camera at that point. You can then use the mouse to follow the action with that camera. Press [ - ] again to exit. Might be useful for video makers.
Good point - key its mapped to might vary depending on individual set ups. ... and it's most effective use is just to tap it if you like the shot and it will hold the view. An example is the ground level camera as cars enter the chase at Bathurst. You can watch the whole field go by with the sound up LOUD.