Me and my friends went to slave pens to get upgrades to our gear when my friend suddenly got the idea to try shadowstep up to rokmar the crackler, so I thought I would fraps it and it worked as expected, this was easily done in a 4man group on normal SP, elemental shaman, shadow priest, hunter, and a 70 rogue for tanking. With enough parry/dodge its probably possible to tank him on heroic aswell, if you have seen the "untouchable" movie you know what I mean. In my opinion this is a really good way to help friends get some decent gear and or just get some shards, another thing is that Mennu the Betrayer is just a second away so killing them both would take around 15 minutes maximum.
I hope you enjoy this exploit and I hope it was worth posting here.
EDIT: The thing is that its way more faster to do this than stealthing through the instance, and even then some mobs have stealth detection if you didnt know they will attack you.
YouTube - Rokmar Fast Run