Buster, I know what I'd really really REALLY like.
I'm 5ft 2ins, and I can rarely see over the nose without a cushion in most f/w aircraft. In some aircraft, and most helicopters, I need a cushion behind me to reach the pedals. So I carry a couple of cushions in the boot of the car, but if I end up suddenly wanting to fly, as I did last week in Florida, I have to improvise - and flying a helicopter with your flight bag behind you is not ideal. So I need an inflatable cushion, which can either be used behind me, or to sit on, or both, and easily packed away for travelling.
And while you're about it, I'd also like a reasonable length ladder that folds to fit in an R22, so I can take it with me to reach the rotors for the A check, if I take a helicopter away overnight.
If you make either of those, I'll buy them instantly.