The Safe connection DOES NOT disable Key Code request. It is a constant 12v feed and it is required for the alarm / memory. Without the Safe connection the unit shouldn't take the Key Code, when you enter the code it should tell you "safe pin not connected".
My car needed a safe pin fitting which was fairly easy. Once fitted correctly you will never have to enter the Key Code again. The car also needs programming via VAG-COM.
My Golf MkV had the Safe connection, the Leon didn't. I just dug a female connector out of an old ISO connector I had lying around and used a ScothBlock to tap in to a permanent 12v+ on the Quadlok connector.
Regards,
fM