From my memory, you need to experiment a bit, but you will soon find the right button:
press U twice (semi-free) find the spot on the track you want (assign buttons to move up/down/left/right) and then you need to press.....''End or page down/up or delete/home or insert''
One of those 6 buttons will completely free up the camera after U was used (I think its the track-camera) and it will not return when the replay is continued.
And press U again to get back into camera cycles again.
edit: you might need to first press the track camera button and then press U, I forgot the sequence.