Hi,
First: I love this tool!
Second: I have a few suggestions to improve Start8.
- Add an option to show the taskbar in metro fullscreen mode (already requested this on the windows 8 blog...)
- Option to use the startbutton for fullscreen and the windows key for the minimized version
- Desktop Metro: When opening metro in fullscreen all desktop elements get invisible and all metro tiles are shown "on the desktop" while showing the taskbar --> Just launch Metro in fullscreen showing the taskbar and using the current desktop background as metro background
- Option to choose my own prefered size for the windowed metro menu by pixel or like a window resize
- Improved Keyboard support: Ability to launch certain elements in metro by using ALT + ....
- Improved Right-Click Options in Metro: E.g. add shortcut to desktop
- Improved Logon: Show the Users directly on the "lockscreen" (the screen showing the background that has to be swiped up first)
Third: I love this tool!
Keep it up! This is the reason why I upgrade to Windows 8! 
Regards!