I think I’ve figured out how to do this – not sure its the best way but it certainly works.
First I create my main timeline but don’t put anything in it.
Then I take all 6 clips ((main camera + scoreboard) * 3 periods) and make a multicam clip out of them and sync with timecode. Then I open the newly created multicam clip in the timeline – I set everything up in there the way I want it (crop/scale/position the scoreboard, etc.) and then copy and paste the entire multicam clip timeline into the main timeline. That seems to work.
I really wish that DR would just give us a ‘sync’ command like Prem Pro has so I can do this all in the main timeline, but this is a reasonably easy workaround. My guess is that either: (a) they will add this soon, or (b) it already exists and I just haven’t stumbled over how to do it yet.
Does that methodology make sense?