Don't raise window on click (while hold)

I'll answer this question myself, in case someone else looks for this feature. As said, I was unable to make it work with Compiz, then for some other reasons I decided to remove Compiz and install Unity 2D with Metacity. Good move for me, as now I found that while holding Ctrl or Super key, application used as drag & drop source isn't raised :)

Let me explain once more using Linux naming:

Maximize Nautilus (it doesn't have to be miximized of course, but it's easier to explain this way). Launch Gedit. While GEdit is on top, press Ctrl or Super, then drag some text file from Nautilus and drop it on Gedit window, which is still on top and even did not lose focus.