Comment 1 for bug 748840

I don't think this would be a proper way to fix this problem. Imagine these user cases:
1) No windows are open, press Alt+F2 and open an application. If the application is, say, a web browser, and if it doesn't get focus, then the user would not be able to simply start typing to enter text in the address bar. He/she'd have to click the address bar once.
2) If its a small application which loads up quickly e.g. gedit, then it would be frustrating for the user to first start it from Alt+F2, and then click it again in the launcher, and then begin typing.

There can be many more such user cases which would be affected by such a change. Feel free to continue the discussion here on this bug. In the meantime I've marked it 'Opinion'.