The clutch switch function on the FZ6 is different to the clutch switch on many motorcycles - possibly that is why it is not being hooked up by the dealers. On a typical bike the clutch needs to be pulled in for the bike to be able to be started even if in neutral - if the clutch switch is unplugged typically the bike can be started with and without pulling the clutch in if in gear or not. On the FZ6 the bike can be started in neutral without the clutch in, but not when in gear, and if the plug is removed it will only start in neutral.
Most used bikes that I come across have the clutch switch removed (however on bikes with EFI - the computer thinks you have the clutch pulled in all the time and leans out the FI mapping - meaning it runs like crap).