The current pre-release of the client ("pioneer" in the version) is only compatible to itself. So you can only play with other testers. Please be aware!
@Blue said:
putting our differences aside to have a fun little game
I'm afraid this is wishful thinking
Maybe all of that could be solved by simply leaving it enabled by default?
That way, people that don't mind wouldn't even have to worry about it and those that do care would have choice.