The lsremote version you have is the latest one available. I'm not sure what the exact issue is you're experiencing, but you should be able to access both screens of a machine with multiple monitors with the Select Full Desktop/Switch Monitor button. It's the second one from the right when the session has started.
There is no planned update of the lsremote tool. If you are having issues with multi monitor setups or some other part of the Remote Control tool, I would recommend contacting support@lansweeper.com and providing a description and (if possible) screenshots of the problem.