in 3.1 there is a new feature added in Interface menu (if it wasnt aded before with im not sure) with is "click and move" option similiar to those in other systems. You can set it on your slave accounts and simply drive your cursor the the 2nd monitor, click on the window where you want to move and keep on pressing the keys, or if your fast enough you can pause the clicking for a short while and quickly click to move your char.