Don't use the following:
Wipers
Headlight washers
Windscreen washers
Seat controls (as I am the only one who drives it) apart from the bolsters inflators, which I inflate upon start-up and deflate when turning it off.
Passengers seat controls, as I don't have passengers.
Rear window de-mister
Rear headrest drop button (apart from when cleaning the inside of the rear window now and again)
Heated seat switches
First aid kit
Cruise control
Auto-headlight switch (I like to turn things on and off myself)
Automatic transmission modes (apart from "C" until the drivetrain is warm)
Brakes (lol.. I hardly squeeze them at all)
Radio
Ashtrays
Rear seats
Boot (maybe just to lay a jacket down now and again)
Unlock/lock button on the dash
Anti-tow alarm button
Warning triangle in the boot (removed to save weight. lol)
Tyre inflator (removed to save weight. lol)
Jack (removed to save weight. lol)
Manual wing mirror fold-in buttons
Charcoal filter button on the thermotronic
Blower vent strength dials (all set on full)
Blower direction adjust handles (all set to a symmentrical direct)
Folding rear seat handles
There are probably other things....
But I do use everything now and again just to get them moving/ test them