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It looks like this can be set as part of the personal profile. I haven't gotten my 07 MCSa yet but I've read through the manual. On page 20-21 it talks about setting the confirmation signals, there is an option for an accoustic signal (audio) but I don't know if it uses the horn or how loud it is.
Thanks guys; i'm one of those people who needs the horn blast to help me remember that I locked the door. I'm very suprised this feature was not included. I hope they add this feature soon.