2008/4/26 Thomas Thurman <tthurman@gnome.org>:
This isn't really a bug in Metacity or in Compiz; what you're really
asking for is either that Metacity or Compiz should be the exclusive
window manager in use or that an enormous effort should be expended on
making the UI of each one exactly the same in every little detail. Both of those are far more far-reaching decisions than bugs in any one package.

I think that

1) gnome and/or ubuntu folks should define a standard behaviour for _basic and very common_ actions such as a click on the window contour buttons or the ALT+TAB keyboard shortcut. Something like "gnome window manager user interaction policy".  Thus the user does not have to unlearn its reflexes when he changes its window manager.
This policy could be quite sparse, I don't thing it' wise to include  every little detail in it.


2) the gnome and/or ubuntu folks should set up the Metacity and Compiz default installation to meet this specification. If some window-manager doesn't meet it => file a bug in ubuntu launchpad or gnome bugzilla for the window-manager package.
If Metacity and Compiz are tunable this seems "easy" (what do you think ?)

3) If Metacity and Compiz are not tunable enough to meet the specification then the upstream developers should fix this => file a bug upstream
This may be a lot of work.

by the way, I filed this bug to submit the idea, I would perfectly understand if it is marked "won't fix"