Having it be a physical key, no matter what, can screw with trying to debug key chords in an app.
And Xcode doesn't use a function key to pause, since that would also interfere with any apps that use function keys. The default keyboard shortcut for pausing in Xcode is ⌃⌘Y, and I think you have to bring Xcode to the foreground for that to work anyway.
And Xcode doesn't use a function key to pause, since that would also interfere with any apps that use function keys. The default keyboard shortcut for pausing in Xcode is ⌃⌘Y, and I think you have to bring Xcode to the foreground for that to work anyway.