See what they offer, as I said though, it's a 2 hour job if you know what you're doing, I've heard of quotes for 4 hours. Don't buy a new lower steering column either, that just needs cutting out with a hacksaw, definitely not worth the £150 charged by BMW.
SSS is the software for all of the configurable options on the car. Car and Key Memory settings which are mentioned in the manual, there's a list here: http://www.z4-forum.com/forum/viewtopic.php?f=34&t=35090