The timing rules could definitely be a bit simpler, but I've opted to come up with my own solution.

Setting LiveSplit to start at a negative value allows me to start the timer when I press space to start the game, rather than waiting for the perfect moment. -4.45 seems to be pretty good, but I'm sure it could be made more accurate. This is really helpful for me because I find that starting the timer at the exact correct moment is really difficult, especially when I have the actual game to worry about at the same time. @MegaMix_Craft Perhaps it would be helpful if we could agree on the exact amount of time it takes for the timer to start, from pressing the space bar. That way, we're all happy! Easy for the runner to time it, and no need to change the timing rules!