Regarding Mission Control and multiple monitors, what it will let you do is if it's on your second monitor in your current space, you can drag it to the second monitor of another space. It is odd that it doesn't let you do it directly (it even highlights if you drag it over, but just doesn't drop). So I guess you have to move it to the second, then go to mission control, then change what space it's in. Although this is just a different workflow it does make a bit more sense. Hopefully a change will come for this however.