With all factory installed alarms I have worked with you can view a menu through a proprietary scanner, perhaps the options you seek will be found this way. With FORD factory installed alarms simply using the door key in the drivers door worked, it was a normal key,nothing smart about it. Try it out,set off the alarm and see if the door key shuts it off.
I see you are asking how to get by a starter inhibit feature not the siren. Are you sure this is factory installed, not Dealer installed? With GM vehicles and a factory installed starter inhibit (PasssLock II) the identifier part was a module at the end of the ignition switch (normal key). So you are saying you have a factory installed starter inhibit that only arms/disarms off of a remote?