Actually I don't think it would be against the rules..
Its bending the intended use at worst otherwise you'd need a policy saying don't kill mobs with players more then 10 ranks below you in your party or something lol.

People farm those annoying static NM's with 50's for lowbi gear with them in party, that again is using a hi level to help archive gain something easier and faster then intended, it would have to be classed the same in many respects.