I think what I am going to do is just stick with 1 computer per Zin for right now. It's not exactly what I had in mind but going the hardware route is 100% rock solid, needs no further development/customization of WoW Maximizer, Autohotkey, Multibox or the dual mouse option. I lose a little flexibility but I completely eliminate any chance of running afoul of the EULA as literally everything will be hardware based. Plus, I can use the 30" array for normal computing and other things - rather than having a dedicated WoW setup that I will not want to use for anything else due to the bezels between each monitor.

The downsides of course are a much more expensive set of monitors and Vetras, more power use, less flexibility software wise, less accurate mousing broadcasting.

The only one that bothers me at all is the last one - the mice. But I can solve that with a workaround. Being able to broadcast more selectively with the mice would be a nice option though - it is impractical to have 12 mice on my desktop - but that said I only need to use 3 to control most all functions. Same with the keyboard - I can route pretty much everything through a single keyboard with the use of cascaded KVMs and multiple levels of Y-Mice per machine - for things like desktop administration. This will not work for PvP but makes it easier to make changes on a per machine basis. Prior testing indicates this to be a viable option that adds a negligible amount of latency to each keystroke. VNC or other programs could serve this same function in software at no cost with some other drawbacks (mostly speed).