Please add an option to lock mouse cursor into window while playing windowed. Very necessary for multiple screen setups.
Also there is something trippy about fullscreen mode with multiple monitors. I often have a video player open on another screen and fullscreening anno 1800 adds odd freezing to video player which is not consistent with a scenario where computer resources would be drained. Probably a more complex problem to pin down or solve, but this wouldn't be an issue with windowed mouse cursor lock.