We've discussed adding a rally start to the existing start/finish and standing go triggers and I hope this feature makes it into the next major version and is available by April

Just wanted to share some thoughts on how best to implement this. At first I thought it would be best to just enter the starting time a couple of minutes ahead of time. But last Sunday at the starting line the race director changed the starting interval from one minute to thirty seconds. With helmets and gloves on, it would be difficult to reset HLT at this point. And especially so if one is running HLT on more than one device.
So instead you may want to consider implementing a rally start almost exactly the same way as a standing go. The only difference would be that upon sensing acceleration HLT would not record the actual starting time, but would instead measure the starting time as the time closest to :00, :15, :30, or :45. This seems pretty flexible as it doesn't require setting anything ahead of time and adapts very easily to a last second delay.
Deven