Where did we get to on telescope sync alternatives?

Ken, when I was recording the SGP videos I was trying to recall the differences between the sync alternatives on the telescope tab. I did a search on the two offsets through the revision history and forum - I found a historical reference to offset and offset2 but did not conclude if the pair of offset sync concepts were both working in the latest beta. It is not mentioned in the help file either and so I guess some clarification may be required?