It would be pretty cool for all the teams, refs, spectators, etc to be able to see what objectives have been completed by taking a look at the scoreboard on their sidebar.

Green would be completed, red not completed

Like:

TeamA:
Red Wool(Green)
Blue Wool(Red)

TeamB
Orange Wool(Red)
Purple Wool(Red)

Knowing what wools your enemy has completed is a vital gameplay component in any RFW match. Knowing whether or not a team has a wool could be the difference between pushing harder on a wool, or holding down the fort at the Victory Monument. If teams are able to see this just willy nilly, it'd remove that important part of gameplay.

I plan to integrate this for streamers/refs to see, but we will have to be careful not to display this to players for all the reasons @Keanulaszlo mentions.

This issue isn't technically fulfilled as requested, but basic scoreboard support has been added. For maps that don't make use of a scoreboard via command blocks, some work might be done to add scoreboard support for streamers in the future, but that is not a high priority. For now, this issue is closed.