Is there a hack to enable "Source Off" icon on the main screen, rather then going thru 2 or 3 steps.

Much like the sticky "Settings" icon. 

Its really useful in case you want to immediately turn off the volume while driving, say there

is a siren, or emergency situation on the road and you want to hear whats going on immediately.  

on the new NEX(1300, 1330, 2300, 2330, 3300) hold the Menu button. On x000, x100, x200 no way unless you have steering wheel control..