I already posted this on the ISBoxer forum ~2 weeks ago, but here it is (in regard to the "new" rules):

...I thought this was already established. CCP defines "modifying the game client" as putting VFX on top of the game client itself. While, by any normal definition, this isn't actually true since the game client is not being touched in any way (as with any overlay), but made up rules are rules when you're in control of the game. This "addition" to their rules seems like they're just finally getting around to adding it into their ToS, and that's it.
So, again, using VFX on the game client is against the rules as per CCP, and this was established back almost a year ago. However, as everyone here already knows (or should), if you're too good at multiboxing and they can't prove you're doing anything wrong, then expect to be banned because you must be doing something wrong if you're too good when compared to other players doing dissimilar things (e.g. multiboxers versus non-multiboxers).

Also, people who multibox D3 may use what I like to call a "floating dxNothing window" to watch all of their minimaps at once for the purpose of looting legendary items (as well as watch other things). As per CCP's loosely defined rules, you'd technically be able to use floating dxNothing windows to achieve the same things since the dxNothing window is its own program and entirely separate from the game client. This is why their rules are, in so many words, dumb and impossible to understand.