Nah, that's a hard pass from me, and I play plenty of PVP as-is.

PVP servers would end up deader than Dynamis, and any kind of toggle or specific zone would be immediately set upon by griefers trying to bully non-PVPers and low-levels, same as literally every other MMO in existence that tries to incorporate open world PVP, and no amount of "penalties" will ever prevent it from happening. It's not even a matter of "if" such a feature would breed toxicity, but when.