Is it 'safe' to use FN for custom shortcuts
Solution 1:
You cannot create shortcuts using the fn key in the preferences pane (but you can assign Function keys f1, f2 etc.)
The shortcuts interface will allow you to press fn + X for Cut etc, but only X is displayed as the shortcut, and pressing fn + X results in typing X not cutting.
Very annoying for people that switch between Windows and Mac keyboards, since the CTRL key on a Windows keyboard is where the fn key is on a Mac keyboads.