Question: Doesn't Quick Portal last 1 round? So there is no real need to use a quick portal on each and every monster unless you wanted to trap them all seperately.
Aren't you really only limited by the number of push/etc effects the group has per round?
Excellent Point. I thought of this shortly after I posted last on this thread. I'm almost done building my model MONSTERBUSTER that takes advantage of that very mechanic. Also, the main limit to this build is healing surges (3 for each use of Quick Portal - ouch!). But I'm working on mitigating that as well (Durable, Dwarven Durability, etc.).
(isn't there an Artificer utility that allows reusing a magic item's spent daily power. . .?),
Use Magic Item, Artificer 2 Utility sounds like what your talking about. Salve of Power abuse time, Egon?
It's ALWAYS time for Salve of Power abuse 
. . . although I will be using Salve of Power a bit differently in my ideal MONSTERBUSTER build than I would have originally. . . Look for MONSTERBUSTER soon!
