"...when another person, other than the perceived offender, is inside of the vehicle;" It does not authorize force merely to prevent vehicle theft. 

I'm not giving my opinion, I'm stating the reasoning given at time of passage, which you can go read on the Legislative website, and how the jury instructions will read if you ever try to use it as a justification in court. Both clearly refer to carjacking. From the jury instruction:

"A defendant [portion referring to the driver being carjacked omitted] outside of a vehicle may use deadly force upon another when and to the extent the defendant believes it is necessary to terminate what the person believes to be the theft of that vehicle when another person, other than the perceived offender, is inside of the vehicle; this paragraph does not apply to a person outside of a vehicle who is involved in a dispute with a person inside of the vehicle who is a household member of the defendant."

http://www.courts.alaska.gov/rules/crimins.htm#3i