Don't worry Varkie, someone has already done this. Thankfully the infinitely adjustable crank has disappeared off the market. I remember ten or so years ago, at the Argus expo a local inventor had a crank with a slot in which the pedal axle could travel up and down and be tightened at any desirable length. I looked at his contraption and asked him: "So, what problem does this solve?" He got so angry at my rude question that he nearly stuck the crank down my throat. He started blustering, using huge technical terms and some amazing soundbites gleaned from a quantum mechanics textbook. Funny enough, he memorised my name and maintained a grudge until today. Years later I encountered another one of his inventions, this time in a write-up in a local medical journal. It was a slotted or split saddle. He made some strange claims there about the iliac bones. What really annoyed me was that Tim Noakes put his name this it. I respect Noakes greatly, but he clearly didn't apply his mind to these claims. I wrote a counter argument to the journal but they declined to publish it. After all, who is this Johan Bornman guy to call the inventor (forgotten his name) and Noakes bogus? I find our scientific community's approach to counter arguments very interesting. Before they analyse your claims, they ask about your qualifications and weigh the argument accordingly. What happened to independent thinking? His first name was Graham. He also invented the adjustable bicycle.
