I think if you break it down to how the action is supposed to function, Ground targeted spells have a click to begin cast, an aiming mechanism, and a click to fire the spell. Ultimately, this is shortened to two clicks, one to begin and one to finish, if you want to predispose that the mouse pointer is where you want the spell to land before you cast. This can easily be achieved via hardware methods, and can even allowed a synched mouse to offer some form of aiming. Now, short of creating additional mousepointers on a computer, I'm not sure if this can easily be replicated via software. Using a set of predefined coordinates, you can create the effect of leaving an idle pointer over an area to "pre-target" it. You could even generate an option click on the proporionally identicle location on multiple windows. All this strikes me as falling safely under the ToS as to what we are allowed to do. Just my 2 copper.