A couple of things you should know…
First, once you have moved the timeline to the approximate time of the motion event, you can use a pinch-out gesture (two fingers on the timeline moved apart) to zoom in on the time scale. This makes it pretty easy to narrow in on a specific time/event.
Second, left/right soft arrow buttons to jump to next/previous event are in testing now and should be released in an update pretty soon. have been released in the current app. Later on, fast forward/reverse on the timeline is in the plan to be implemented. You can also vote for fast forward/reverse here: Fast Forward/Rewind In Playback