Go for it, kill them all in Assasin Mode, but don't cry when your precious weapon / armor parts will be dropped from you after someone else kill you. Assasin Mode don't prevent from loosing eq when you die.The DC when teleporting while walking is a security feature of the old ROHAN where there's no teleport feature. The game sees you cheating (as far as I know). Well I hope they will find a way to fix it.
as for the MR. I don't know if they take it seriously. Since they already introduce the Guild Battle system. For the mean time I'm going to grind my Dhan & Dekan to kill those pesty botters around. As I can kill them all I want when I'm in Assassin mode