There is a key that lets you jump forward to an incident in Replay Mode but danged if I can find it.
I've already looked in the manual but it's not in Appendix C.
These are the ONLY replay controls according to the README file that comes with NR2003.
REPLAY CONTROLS KEYBOARD SHORTCUTS
C - Change to Next Camera
V - Change Focus to Next Driver
CTRL+N - Unfocus Current Camera from Driver
CTRL+V - Change Focus Back to Player Car
SHIFT+C - Change to Previous Camera
SHIFT+V - Change Focus to Previous Driver
Keypad1 (END) - Fast Forward to End
Keypad4 (Left Arrow) - Frame Rewind
Keypad5 - Play/Pause
Keypad6 (Right Arrow) - Frame Advance
Keypad7 (Home) - Rewind to Start
Keypad8 - Slow Motion Mode
SHIFT+Keypad4 - Rewind
SHIFT+Keypad6 - Fast Forward
Keypad. (Del) - Switch to Live Feed Mode
S - Display Standings (Full-screen replay only)
Space - Toggle On-screen Display of Replay Controls
Note that all of the replay keypad shortcuts listed above may not function properly if NumLock is enabled on your keyboard. If you experience problems, it is recommended that you turn off NumLock.