Actually, if the shaiya rules apply, Stat Padding would apply to two different groups feeding each other as well. If it could be proven his intent was to feed kills, that would be against the rules.
I will say this: It's still a gray area here, as no one's really outlined what actions are against the rules in pvp for DKO yet. They haven't even outlined a definition of Harassment yet, much less pvp rules.
They will eventually be publicized; we all know this and expect it. So atm, it's more "do so at your own risk." (We know it's wrong, but we justify it by saying there's no rule written).