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I set it to use WIN+q, nothing happened.
I set it to use WIN+1, but it didn't change the default function (Win7-64b) of minimising/restoring program #1 on Taskbar (which happened to be FF).
When I then unchecked the hotkey specification, BUT kept the "Hotkey" checkbox checked, the function of keyboard key "1" was suddenly = ALT-TAB?? (NUM 1 worked as "1").

Also if you close to tray several windows you can't END them separately (no such option in tray, and both ALT-F4 and close-button just trays).