With the talk about maximising and docking with the mouse I think you might be talking about tiling, rather than docking. That is to say, dragging a window to the edge of the screen and it expanding to eccupy half the screen. There is a setting in xfce to do that, but I don't use xfce so I can't tell you where it is. Probably in with the xfwm or compositing settings. Might be somewhere else if you use compiz.
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