Quote from Rmarmorstein
I suggest switching it to bukkit, just for admin plugins like logblock. and anticheat. and then it can still be vanilla-ish, because you are not using all of those "modifying plugins" just my input,
and if you are having a problem with this individual why not just ban them?
I second everything in this.
I highly suggest switching to bukkit. Purely for admin plugins. Plus yeah if you are having a problem with the player just ban them?