On the PC flash, and PCEA versions you can. (not sure on the
mobile version). On the PC and PCEA you are allowed to have games for up to 4
players in 2h2 matches at any giving time.
To talk to each other during the game if you don’t like WGT’s
chat box, use a 3rd party program like Discord, or telegram. Our
club uses the Discord app with the voice chat feature so we don’t have to type,
we just talk to each other during the game.
As far at the betting. I don’t think there is a way to bet
credits, but you can make side bets with your opponents for stuff like balls,
clubs, or whatever from the pro shop. After the game just gift the item to who
the winner is.