Hi Alan, and thanks for your concern.
At time of installation you can decide what gets disabled when you turn it off via the phone, eg you can have the alternator switch off so the battery eventually goes flat, or you can have the fuel pump turn off, etc. etc.
As far as insurance requirements I reccomed getting the alarm installed along side a black wired set of immobilisers.
cheers,
Greg Kruse - GK Technologies
www.gktech.com.au