Steve,

Fn+F1 on Dells actually sends Super+P. However I don't know if some
models send it as a quick Super+P tap or the virtual keys are held for
the duration of Fn+F1. But the point is that "Fn+something" is not a
real key. It maps either directly to some hardware feature or to some
other real combo like Super+P. You may well get a quick tap of Super+P
when Fn+F1 is pressed.

The two features we have for avoiding false taps are:
  1. Reliable tap detection in Compiz. This has to be turned off in order to 
fix this bug :(
  2. Key press timing in Unity. If Super is down too long then ignore it.
So #2 is all we have left.

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https://bugs.launchpad.net/bugs/950160

Title:
  Unity blocks other programs from binding globally to Super+* (* = any
  key)

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