It's already as clear as it needs to be, IMO. There are more than a few places where they say you can not send 1 keystroke to all accounts and have all accounts respond to that same keystroke.

Multiboxing is allowed so long as each character performing an action requires a unique and separate keystroke.
Their idea of multiboxing now is the old-school alt-tab method. 1 keystroke = 1 action on ONE account. You want to round robin actions to each instance {1st press > acct 1, second press > acct 2} that should be fine. But sending all presses to all accounts is no longer acceptable to SOE.

People coming back saying "Well I haven't been banned" is not confirmation, it is the same as people coming back to the WoW boards saying "Well, I share accounts and I haven't been banned, so go ahead and do it" IMO. We have 4 responses from 4 different CMs all stating the same thing and dozens of responses from players trying to to say that SOE is talking out of 2 both sides of their mouth. I don't see a single CM response that includes "quote quote, wink wink, nudge nudge".