OK, when paused, you use F1 to F9 to control replay...
F1 goes back one marker (those black lines over time bar)
F2 goes ahead one marker
F3 pauses/unpauses the replay
F4 enables slow motion (when unpaused) or frame to frame (when paused)
F5 rewind at 4x speed
F6 rewind at 2x speed
F7 fast-forwards at 2x speed
F8 fast forwards at 4x speed
F9 turns replay bar on/off (but it's still active when off)
GPGSL-3: Fox race driver and team manager - 2011-2012 Constructor Champion - 2012 Driver Champion
Season 9 - #18 Erick Von Draxeler - #35 Marcus Bongardt