My vote would be for a heated seat.
Failed! you said not currently available! Go & check your BMW Accessories list.
I vote for handlebar controlled exhaust noise & numberplate inflator (increases size to legal) - when you see Plod! (I know there’s a throttle control on a handlebar, but when I turn that down, it’s almost as loud on the overrun!)
Visor-wipers
Laser beams
Head-up Display integrated in the lid, showing revs, speed, indicators, and satnav … oh and a bit of the road directly ahead.
A cloaking device for bikes passing Gatso’s:D
Prescription visors so I could ride without my glasses and still see
Self cleaning body work.
Rocket Launchers:D
They are called contact lenses.
I am also in favouror of the visor wipers, but would like them to be moisture sensative and include a washing system that squirts washer fluid over my head and into the eyes of the car driver behind me!
psml
Londonbikers forum on dash to keep uptodate on the move! 
Been thinking myself previously that all you need when the roads are wet but it’s not raining which makes your visor dirty would be a washer spray in front of you. Hmm!
a force field around bike and rider
Not everyone likes wearing contact lenses ie: Me, hence my post :doze:
You beat me to it!
Gattling guns that lock on taffic wardens please
Looks like we can have our own LB episode of Dragon’s Den.
A intergrated led screen on the back of me leather that translates my speech into lettering so the NOBS that hog the outside lane on the A13 know how pissed off i am with their driving once ive had to undertake them!
Bike turns Invicible if seen by the cops - no seriously a bike that creates a forcefield around you, so there’d be no more bike accidents…
Dooh!:Whistling: