first thing to do is replace your frt brk hoses to stainless steel hoses. then you open the ol summit racing book and order yourself a line lock kit. install it with a somewhat hidden switch and your all set.
all you will have to do is hold your brk pedal down and flip a switch, let go of your brk and until you flip the switch again your frt brks wont be released. how far is someone going to go if your frt brks are locked up? i would also do something to disable the starter between the starter solinoid and the starter, but the brk idea will work.
another thing i would do is instal another starter solonoid under the battery tray(hidden) i would wire it up with only the starter wire (not the power wire) and run it to a switch inside the cab. then i would shrinkwrap the connector for the starter wire on the starter connector so noone can lay under it to jump it over.
another thing is to run a battery cut off switch between the starters power wire and starter solonoid, hide it under your frt bumper or inside the cab.