I notice there is a tab for Simultaneous Play under the Rules tab in the board designer - is this the equivalent of BAO? Also, it appears to be grayed out -- am I missing a toggle somewhere to turn it on, or is this feature still "under construction"?

Sim (Simultaneous will NEED some sort of abbreviation!) Play (aka BAO) is under construction still. Looks like he already has some of the settings and information out there though, but no exact ETA that I'm aware of.