Hey man, cool that you're trying out new stuff. I hope you can keep the good work up! Ignore people that are getting mad because new features don't immediately work, their expectations are straight out stupid.
Actually PVP does not work at all no matter what you do - any battle in Arena, Ship Arena, GAC and Journey freezes and crashes the game.
It is one thing not to have a defense multiplier, and another to be unable to play in any PVP event in-game.
I guess the majority of us would be fine to disable defense multiplier but at least have the ability to play PVP rather than haveall PVP events undoable in-principle.
Of course,the author of the mod is enetitled to modify it as he/she sees fit, and we have to find an alternative (if any) that does not block half of the game's content.