Well, what they said isn't actually outside the realm of doable if you're clever. Since they said you can have multiple characters online and following one character, the hard part is done. That's permission.

The restriction is that one keyboard button press or one mouse-click must equate to one single action on one single character, and each character needs to be controllable with its own respective keyboard and mouse. It also doesn't say that you can't use 3rd party software to launch a game window, just that each character must be controllable without using it.

Soooooo. Those're the restrictions. The first thing that comes to mind is a virtual KVM switch, since swapping is instant. Second is multiple numpads with a wooden dowel across each "row" of buttons. Third is uh, not allowed as a discussable item on the forums?

Yeah, the mini-numpads with a dowel seems pretty sweet. Since you can set all of your guys up to follow your main outside of combat, you then just have to worry about a mashable dps button while in combat. Does the game auto-assist to a friendly character if you cast a hostile action on them?