Fix to behaviour of Pie menus where they don't release unless the mouse is moved first.
I believe this fits with the intended behavior:
Setting the tap timeout to 20 (default) or so will cause short taps (<20ms) to stick the pie menu open and anything longer to close the menu on key release.
Setting it to 1000 will make it act like it is now where a very long hold ( <10s) will still result in the pie menu sticking open.
Setting it to 0 will cause the pie menu to close no matter how short the key was tapped.