I have mouseover macros working quite nicely to heal my party while controlling my warrior. I use Pitbull to get the party frames on my two windows to match each other.

I have my priest's macros set up so that if she has a mouseover target then she will cast on the mousover, but if she does not have a mouseover then she will cast on my warrior. The problem with this is that often times there will be people in random parts of the priest's screen, so she'll end up having a mouseover target when I don't want her to.

Is there a way to make it so that the cursor location is transmitted to the priest only when the cursor is a certain region of the screen?

--OR--

Is there a way to make it so that the cursor location does not get transmitted if I'm holding down the right mouse button on the warrior's screen?

I know a ghetto way to fix this would be to zoom the priest's camera all the way in and have her stare at the ground, but I like being able to see what's going on around her.