My last two Ford Trucks came with the push button door access. This pretty much solved my problem of keeping all of spare keys in the truck glove box...
I guess if the truck battery is run down I would have a problem getting in without a key??? Hopefully I could back feed 12VDC from the trailer connector??? will have to test that idea...
I am also leary of removing my battery terminals as when I did that a couple years back replacing an alternator on my older truck the on-board computer lost its settings and I had problems after that mainly with idling at too low of RPMs and motor dying. Manual said ti would repair itself but never did. I finally had to take it back to ford to put on their $90 per hour computer charge to reset things back to normal...
Roy Ken