Add "Show the desktop" shortcut at the right corner of the taskbar...
Well, it's a bit annoying not being able to do this quickly, and having to press Windows + D, or minimize one by one the tabs.
It would be great if this option was added, even if it's not like in the original system.
And about the gap... it's simply despairing

I use windows 7 64 bits service pack 1, 1366x768 monitor.