I was going to say I was happy with mine just the way it is.
But now I think of it I want suspension with two modes - how it is currently for country lanes and a super soft mode for places with speed humps(read chelmsley wood) and lots of potholes (Dudley you know who you are).
Same ten spoke wheels but made out of a secret mega alloy that it is impossible to scratch.
Oh and I'm with the four wheel drive as well - but one you can turn on and off - what the hell I want the choice of front wheel, back wheel and four wheel drive so you can choose which on suits you today. And make that a third mode on the suspension that lifts it up like an off roader so you can choose if the four wheel drive is for grip on normal roads or snow. And intelligent traction control that know what the road conditions are.
Anti tailgater exocet missiles would com in handy occasionally. And the whole car should expand in size for long motorway journeys. And if they can fit tardis technology in the boot so I could move the odd piece of furniture instead of needing to hire a van that would be fab.
And sort the engine so it does 200 to the gallon while your at it.
But generally I'd keep the car the way it is

Paula