Hello.
I think that it could work if you if attach a second USB mouse to the client host and forward it to the server.
When you are connected press Ctrl-Alt-0, select “Devices” and “Connect a USB device”. Select the mouse you want to forward and press “Connect”.
Be aware that forwarded device disappear from client host, so it is better to use a second mouse if you need one on the client while playing the game.