Synergy would be very helpful in your case. Synergy is software that links two (or more?) computers together, that will allow you to send your cursor to another screen. In your case, you could play with your main, then accept a quest and share it with your party (your slaves), and use a single mouse to click accept on each WoW instance.

I use it, and I have four slaves on my secondary computer, and my main on my main computer infront of me- with monitors sitting next to each other.