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...
Given the fact that you can complete dailies by simply entering a ship battle and 2 arena battles (no need to actually play them through), the only downside of the mod is that:
You cannot complete PVP battles so cannot progress in Arena or Ship Arena (not really a dealbreaker at most you miss...
My only issue is that PVP crashes immediately upon enemy's turn under all possible settings (and same happens with all Journey battles). So this means to play we need to always do PVP in the original version and only use this for galactic challenges (since everything else can be modded)...