The short mode simply suppresses the full-length voice prompts.
So for example "Please enter house number, street name, city, and state" becomes "house number, street, city, state"
Helpful once you've mastered most of the commands.
2014 Jeep SRT - White/Black
2014 M6 GC ZCP CCB - Frozen Gray/Amaro Brown
2014 X5 xDrive50i ZMP - Space Gray/Ivory (On Order)
2013 Tesla Model S P85+ - Gray/Black (Sold)
2013 F10 M5 (Sold)