OSX Exposé, compiz scale windows picker question

[Milan Oravec <moravec ukf sk>]

hallo, I generally like Gnome3 (gnome-shell) concept, but i my opinion 
it needs to be more configurable to give people chance to "personalize" 
their desktop to their needs. Not all people want to live in uniform 
world. I have few questions:

1. is there in gnome-shell any way to show all windows (running 
applications) from all workspaces at once similar to OS X Exposé or 
compiz scale windows picker? In activity overview are showed only 
running applications from one workspace.

2. is there any option/setting to assign this functionality to mouse 
button? For this functionality I use scroll wheel button.

It is quick way to switch between applications and it is not against 
design concept of gnome-shell, what I think and hope.

Thank you very much!

Best regards Milan.