The trick is to import the data log more than once. Say you had 4 video clips;you import the same log, 4 times. Then you trim each log according to the start and duration of each clip. You join the videos in a group and you join the logs together in the same sequence as the video clips. The data is now in synch with the video! If the programmers for RaceRender develop some simple transitions in a future version, a nice video can be created. Hint Hint
I'll provide a simple example for other newbies out there. Say I go out for a 60 minute trail ride on my bike. I start my log and video capture the first 10 minutes of the ride. I then turn off the video for the next 45 minutes (the data logging remains on) For the final 5 minutes, to the finish, I turn the video capture back on. So my data log is 60 minutes, and I have 15 minutes worth of video; 10 min at the beginning and 5 min at the end.
In RaceRender, I create a new project and import both video clips. I also import the data log twice (RR will number them sequentially). For the first data log, I trim the log to the first 10 minutes. in the second log I trim it to the last 5 minutes. I join the two video clips into a group and I do the same for the data logs. The videos and data are in synch and I render the final video.