Your dealer can update a lot of these settings. There is a pdf file available on Lexus.com that describes all of the possible customization.
I had them set my car up so that it doesn't automatically unlock on my F, which is how I set up my previous car. I figured that is safer.
If you want me to send you the PDF, PM me your email address and I'll send it.
Jeff
08 Smoky Granite Mica IS-F