What steps will reproduce the problem?
1. Using the Mouse-Over option.
2. Mousing over a friendly unit and pressing an action bar key binding associated with a spell castable on friendly units.
What is the expected output? What do you see instead?
I expect to be able to cast on players with the new Mouse-Over option by hovering over them in-front of me, as well as being able to hover over party/raid frames and cast by pressing the key. I expect to see bars redding out if I'm out of range (is this implemented?) when hovering over a target in-front of me that is not in range. Instead it acts just as normal as if the Mouse-Over option was not enabled (it is definitely enabled for the bars in question without a modifier).
Additionally: I'm assuming the targeting prioritisation would be mouseover>target>player and not target>mouseover>player (though an option might be nice for the other?).
What version of the product are you using?
Do you have an error log of what happened?
Please provide any additional information below.