nice work!
I had the impression Rogues would be most fun out of all the melee classes to 5 box with.. even in Arena

i always fancy the idea of Cheapshotting with my main and have 4 rogues ambush a clothie right behind you.. then vanish and repeat..
and in the case of having to get behind ppl.. stunlocking with your main and have the 4 clones shadowstep behind him.. mobility issues are then somewhat reduced. would still be very difficult and you would require a lot of skill/luck to pull that sort of thing off.
as for pve having shadowstep rogues as clones could be the answer for raiding multibox rogues