We're reluctant to add this feature as there are so many caveats that make implementing this feature more than problematic. The first thing that comes to mind, would be different resolutions. If you were to broadcast the same mouse inputs to two different desktops with different resolutions, the outcome would be very different on both desktops not to mention potentially dangerous.
I think you're better off using a key sequence task to target multiple connections. Keyboard input is a little less prone to errors than mouse input.
Michael Barrett
For example, if you were to click an area on the screen of one remote session, it would click the same area on the screen across all remote sessions. This would essentially make each connection (of the user's choice) mirror each other by only controlling one of them.