If there's a problem with the mouse pointer handling then I think it's caused by the width of the display being misreported: If the display width is reported as too small, then the phone software stops the mouse pointer being allowed over the full width of the display. Just guessing though.
I'll try and get in contact with Samsung - I'm expecting them to say "it works if you plug the display into the dock, talk to the people that wrote DisplayLink Presenter"