[knowom]

I believe 3 or more sides are required if you want ideal load balance between sides because players aren't always very good at policing themselves. That is the primary reason why PVP generally worked in DAOC/UO and balanced itself out by the player base itself. WoW and Warhammer by contrast have gone through continuous server migrations in order to help restore lopsided balance issues.

You might be able to get around it by forcing the VZ/TZ faction flag to be a deity based one rather than race driven one upon player creation like manipulating /guildwar with deity based guilds you belong to. You could then enable/disable a set amount of deities for every race and let players choose deity irrelevant of race selection based on a set selection of them. That's really how Sony/Daybreak should have done the VZ/TZ faction servers in the first place it was a huge balance mistake restricting it instead based on race selection.