Scroll to zoom in/out.

[Jason Sauders <roastedtiresx gmail com>]

I swear by the function to hold down super key and scroll in/out with 
the mouse to zoom in/out accordingly. I cannot put into words how 
exponentially handy this tool is, for both just showing somebody 
something or when a user has a specific question about a presentation, I 
can just BAM - zoom in - and there it be, blown up for easier reading.

Since the super key is bound to activate the overview of Gnome Shell, 
it'd be handy if this functionality can still be added. Yes - I know we 
can add it under keyboard shortcuts, but it's 100% more convenient to 
use the scroll wheel to zoom in/out instead of repeatedly hitting a key 
to zoom in/out. If the user holds down "alt" and clicks+holds anywhere 
on any window, they can move it. What if alt+scroll is bound to zoom 
in/out? That'd be pretty handy.

Also - I know I harked on this a lot - but I figured I'd do it again... 
are we going to see some sort of dock-like or somehow an integrated 
system to quickly switch between active applications WITHOUT having to 
go to the overview mode (or alt tab) to do it? Thanks! :) :) :)