Q about TrueSync & PUN: Later Join, Start Game Together, etc...

Hi have some question after trying TrueSync

1.Will TrueSync support "Later Join" feature soon? Now if a player joins a game in process, there will be errors on "get key". I heard there will come a new release, will it contain this feature? And when will it come out?

2.For now is there any good alternative to realize "Later Join" in TrueSync?

3.Are there any tutorials about "wait and start a game together"? TrueSync does not allow "later join", but its official tutorial has nothing about "start together", neither in Pun's official tutorials.