I have a dual monitor setup, and I have to immediately thank you for caging the mouse to the active monitor. So many devs forget to do this, and I have to use external applications to get it locked!

However, I must complain that alt-tabbing to check my email shrinks the game application to the taskbar. It's still running, I can hear my combat sounds and little radio calls coming out of my speakers, but I'm blind to the action! Argh!

I must also complain that the game doesn't give up the single-monitor mouse lock even when minimized. I can get around this by shrinking/expanding a window I have on my second monitor; it seems to unlock the mouse for some reason. But if I have no other windows open but the game, there is no way for me to go clicking over there!