1 Alarm,,Is good for me cus my truck is 15 feet in front of my apt`s kitchen window,and my liveing room in right behind that.So its super loud when it go`s off.
5) starter disconnect switch. ..JCW sells them with a removeable key.
6) brake pedal lock...They make them that go from the brake to the floor,very hard to cut off.
The rest of Jekbrown`s ideas are great.Just not good for me.
I like the coil wire idea,but im to short to do it LOL
If its a standard , put a switch in the clutch saftey switch somewhere.So if you hit the switch on the dash it wont work when the clutch is pushed in.
I either saw on a car show or read in a mag..doesnt matter where lol,to use a switch that doesnt look like a "switch" ,like a wiper switch or cig lighter for a temp switch [I cant think of anything else] ,anything that would look normal for a ,fuel pump or coil wire cut off.