in my honest opinion, with the damage to the rear as it is and the damage to the unibody, the chances are very high they will total it.
if, as mentioned, you do wish it totaled, then you really should do as mentioned, flatten both rear tires and unplug the fuel pump at the tank.
if it wont start, coupled with the damage, they will definitely total it out.
currently its sitting with 133xxx miles on it. as much as i would love to disconnect things and milk it for what its worth i dont want the risk of what could follow. who knows with the hurricane thats coming thru maybe a tree will on it while its sitting and waiting. still no one has looked at the car yet.