This is terrible, I've been playing with this feature so long I miss it. It's a hassle to move over now, and takes more time to click and drag. God forbid I accidentally right mouse click instead of left mouse click, then my unit goes halfway across the world (figure of speech).
I believe even Civ2 had this feature, I'm sure Civ3 and on had it. But it is so broken as is, I can't use it. I can't read the notifications on the bottom right without the screen scrolling (unless I'm real careful). I like to read every notification.