Throttle sensitivity, there is no buffer to the pedal?

Unfortunately, there is no way to alter that, your pedal is a simple electronic item that changes resistance as soon as it moves from the at rest position. There are basically two potentiometers in the pedal assembly (like old style volume controls). One goes up in resistance while the other goes down as the pedal moves. The computer reads both to determine the amount the pedal moves and then opens the throttle body that amount. Now, being this is a Camry you might want to look up under the dash and verify that someone didn't install a "Pedal Commander" type unit. That is a box that goes between the connections on the pedal assembly and the car and doubles the throttle input. They seem to be another of the fad items that the younger folks think is a good idea to install on these cars to make them faster in races. They don't actually work any better than putting your foot to the floor, but it's a way to empty out a wallet.

https://pedalcommander.com/products/toyota-camry

Sorry, The E brake has an adjustment for it to keep them working but the throttle doesn't use a cable. It is just a spring-loaded lever that moves the potentiometers. Bolts to the floor with 2 bolts and a wire connection.