Not immediately obvious if a "snap to edge" behavior is available for moving windows
Here's a general rule of thumb: if it didn't happen right out of the box,
Metacity doesn't have it. :) There are very, very few exceptions, and this
is not one of them. You might find
useful, if you haven't already. The things in there are most of the important
Not immediately obvious if you can alt+click to drag a window around
I'm not sure what you mean here. Alt+click and then moving the mouse moves the
window until you release Alt? Alt+click and then move with the keyboard? In
any case, however, I expect the same rule given above to apply.
Not immediately obvious how to set different backgrounds for multiple desktops
You mean there's a window manager where that is immediately obvious? :)
I doubt it's doable; if it is, it's probably a major hack. (For example,
IceWM lets you do it by making one huge composite image and using that as the
background, or did in older versions, anyway.)
Not immediately obvious how to edit GNOME menus
You have two options:
- Through the context menu of the item you want to edit; call that up
by right-clicking the item. Folders, including the menu's top level, are
edited by pulling up the context menu for an item in it and choosing one
of the options in the "Entire menu" sub-menu.
- Point Nautilus at applications:/// and do it in a pretty
typical graphical file manager-y way. It'll give you a context menu
appropriate for editing menu items and folders while you're there.
So, you got two actual answers, and two pseudo-educated guesses. How's that? :)