Here are some handy tips for making QEMU work much better with your Linux desktop. You can now park QEMU on an unused workspace and not have to click in your QEMU window to use your mouse in a QEMU guest.
Integrating QEMU a bit with your desktop
Presently you have to run QEMU with a slightly lower resolution than your real desktop or run it in full-screen mode to get a decent experience out of it. With a patch I have written and a few tricks it can work a bit better.