i wanted to share my idea with more people. i am hopefully by the end of the year going to build two smart key scions. that is with my keys simply in my pocket, unlocking and disabling my alarm, starting my car with the touch of a button, and have a one touch arm, lock.
i will be updating now and again. later

 

so you accidentally start your car without knowing?

 

if im thinking along the same lines as the OP, its InfaRed/Blutooth where theres a "key" in your pocket that relays to the ignition pretty much telling it like "hello, im here in the drivers seat, you can start now"......similar to a toyota highlander.

 

soo basically u want your xB to do what a BMW does?

 

yes the key would have to be in the drivers pocket. ad screw bmw. like the prius, highlander, ect.

 

Nissan and Porsche have it as well.

 

My aunts Cayman doesnt have it lol. probably on teh higher models

 

my dads cx7 has that

 

My friend's Cayanne has it.

 

I think some Cadillacs have that, too. It's starting toget common, but it's still really slick.