Shakerpaging works basically like this:
Warrior takes off all haste, then gets slowed by a shaman (this is important), warrior grabs ton of mobs (the more the better), hits a Riposte to all discipline (I think it was Furious).
Because crapload of mobs are trying to hit the war and war is riposting them all you get multiple Shaker procs(of course could be any other proc, but we want AOE procs and shaker is the best) going off. If I remember it correctly, fully slowed warrior had about 50 percent chance to proc off each riposte.
When it works it is just a wonderful sight to behold, when it doesn't (lag, etc.) warrior dies very very quickly...
As for the original question, you mentioned no summon... as far as I know there has not been a working no summon crack for a while.
So yeah Plane of Fire, Earth would be best, shakerpaging is not against SOE rules (although they really do consider the riposte counting as regular hit broken) so attract all the attention you want.