If it is within the ToS only Blizzard can answer, and they seem to be a little bit general in their answers (see: http://forums.wow-europe.com/thread....01104439&sid=1 )

My personal opinion on this is, that your scenario should be ok, but as I said this is only my opinion (and nothing worth therefor).
One question which could be discussed is if the moving + pressing a click is aganst/or in the "one action per user initiated action"-rule, or if it is seen as two different action and therefor should be done in two seperate actions (what also would be doable).

As your asking if there tools which actualy do the scenario you described:
-Yes there are (HKN, IS, Keyclone (although keyclone requires one click per client, i think) are the ones I know ).

-Are this tools 'official approved' for mouse-broadcasting? - I don't think so (or at least I don't know, maybe someone has some blue qoutes?)!
(I think HKN and IS will never get an general state of approval, because in both of them it all depends on the user and the features he is using if its ok or not. And keyclone did get a general 'ok', but i don't know which version explicit this regarded, and if the mouse-broadcasting where in them)

- Why aren't this tools also a 'discussion-no-go' because thei might be (partly) against the ToS ?
-Because non of their authores advertises them as 'safe' and 'blizzard-approved' in regards to mouse-broadcasting, and all of them say very clearly what functionality of their tools can be used in WoW and what not (the later part is more relevant for HKN and IS).

Would I like to get 'closure' from blizzard about mouse-broadcasting in general?
-Yes I would, and I tried to get an response (see: http://forums.wow-europe.com/thread....01104439&sid=1 ), but the response I got was not realy a 'Yes' or 'no', so maybe someone with more credibility may ask in the American forums again...

..just my 2 cents