Here's how you ask (to save as much time as possible):
Hi, I have a 2013 3-series, and I was wondering if your service department is able to convert my auto-stop-start to "last user mode" based on SIB 12 15 12.
The service advisor will know exactly what you're talking about, because this SIB was so popular. If they say no, call another dealer until you find one that will.