you will never get scores from requesting info of the connected players (getConnectedPlayersAsync). Since there can be several leaderboards, so it is impossible to know which score to fetch. So no info of any score is part of this request.
you can though get scores from connected players using the leaderboard function (Leaderboard.getConnectedPlayerEntriesAsync) as you say. Which is the update in v6.2 and it is already implemented which I described, so yes, it is covered! But from this function you will not get the IDs.
Scirra do not decide this, this is how the IG functions work. You will need to adress this to Facebook, not to scirra.