[Biturbos4] Lock car with engine running?

[Power, Sean Austin (UMKC-Student)]

Has anyone figured out a way to lock an Audi with the engine running?  

 

You are probably wondering why someone would ask such an asinine question.  Here's why:

 

Generally, in the morning, I like to let the car warm up for 15-20 minutes before driving it.  I am concerned an enterprising, yet scheming, passerby might notice the opportunity and hop in and take off.  Believe it or not, this recently happened to a friend of mine that lives relatively nearby - one minute eating breakfast and the next, nothing but footprints and tire tracks in the snow where his car was.

 

On my previous car, I could do this by using the remote entry key to lock the door once outside.  When warming up my S4, I use the valet key to start  the car and find that the keyless entry does not function once started (neither does the button-activated automatic door lock). I have the sneaking suspicion that I am overlooking some extremely simple method to accomplish this, but have yet to find it.  
 
Thanks.
Sean
2001.5 S4