Well i dont know much about other security features
but what Butt sb did in my GLi is as follows
jese baqi keyless entries mei hota hai, iska b remote hai for lock / unlock
phir jab aap ne unlock ker lia ho, and u start the car
u have to input chor switch combo
it is tricky
and no body wud notice k yeh chor switch on ker raha hai
khair it can b changed as desired
ager aap ne start ker li aur chor switch na enter kia, gari thora agay chal k/ ya thori dair mei(with respect to time), band ho jayaygi and alarm bajna shuru ho jayayga
aur yeh feature har bar driver door khulnay k baad kerna parayga ( can b turned off as well )
faida iss ka yeh hai
Allah na kere, In case of car snatching, chor gari ziada door ni le k ja sakay ga
now about parked car security
well GLI mei pehle b security system tha
woh Butt sb disabled infront of me in a matter of seconds
just neeche hath daal k aik wire nikali, and tadaaa, no security system
what he installed
even if u remove battery terminals, and dubara laga do (ya battery k sath any chair chaar ), car fails to start
wese to security system is hidden, but it is integrated in such a way k ager woh remove b ker dia, toh car will fail to start
Just wanna say, I like this man's Work
and yes, cant guarantee it is 100% Fool proof, but market k security systems se kafi behtar hai
Also ajkal k chor baray mahir hain, per this security system will offer them more resistance than conventional systems 
