One thing I miss in Metacity that I don't see filed yet is the ability to
right-click on the menu bar and have the window drop to the bottom of the
stack.  Particularly since one can't turn off raising a window when you
left-click, it would be nice to be able to push it to the back without some
complex combo of key presses and mouse clicks.

(I also miss edge magnetism, edge-flipping, and dragging a window across a
workspace boundary, but that's another story...)