As the title states, I think we should have access to /fix into OPPvP. Like KitPvP, Gods and Titans have access to /fix, But in OPPvP, As it's supposed to be OP, I think all donors should have access to it ;)
Even though the gamemode is called OPPvP, implementing the command in would make the gamemode a little bit more OP. :p No support.