Hi,
Just downloaded the beta and am trying it out for the first time. I'd like to recommend that one of the UI features should be the ability to lock the mouse cursor inside the window when it is the actively selected window.
I'm currently running 3 monitors on 2x crossfired Radeon 6970's, currently set to multi-desktop mode (instead of Eyefinity).
I've noticed that when I run SSE:R in both windowed AND fullscreen mode, the cursor fails to lock into the window, making it almost impossible to use the mouse to move the screen around (instead of stopping at the edges and causing it to move, it continues moving out of the windows bounds and onto my other desktops). Although I CAN use the arrow keys to move the camera, it is frustrating and less intuitive.
I'd expect this non-locking behaviour naturally from windowed mode (perhaps with a UI toggle that allows me to turn it on or off), but I found it weird that it also happened to me while running in fullscreen as well. Anyhow, having the ability to lock the cursor to the game window would be extremely useful for me (and I'm sure for many other people as well!).
Thanks!