The command unfortunately will have the slave interact with their own mouse, not the mouse of the master.
The same as how the slave has to assist the master, or otherwise acquire the masters target before interacting with target.

If you have mouse broadcasting enabled and camera angles/zoom etc are the same, you can have the slaves mouse basically in the same position as the master's mouse. However, it is just as easy to right click at this point, as it is to push a keybind.

It would be neat to interact with the target or mouse over of someone else. Don't think this option is anywhere in the game yet.