Ive given my idea already, about modification of a standard leaf. That "IS" a product idea. And, in fact, its a great one, which fixes the typical leaf problem of over-shoot leading to over-bend. (until poor performance and cessation of functionality)
Since it's a "typical problem", don't you think anyone with half a clue already understands this issue (and likely did over 20 years ago?) Do you know what the industry did to solve it? They developed the "snap switch". Then they re-designed the controls to use said snap switch.
Btw - If someone were to ask me what is easier:
1) Getting a 20+ yr old joystick shell remade
or
2) Getting some source of Leaf switches made up...
Id have to say option 2 Should be easier. Maybe that is my ignorance...
I'd have to say that it is. #1 would be no problem, given the capital for tooling. Molded plastic parts are made all day, every day, in thousands of factories around the world. #2 would require resurrecting a nearly dead industry. But if you bothered to research these things, you would know that and not be wasting everyone's time pushing for things that would be so expensive they couldn't be sold and may not be attractive to the majority in the first place.
There are sources for leafs and if one really wanted them, some compromises can be made. But the days of the really nice stuff at a reasonable cost appear to be gone. That's why viable alternatives are important. And again, if you really wanted to contribute to your "cause" then feel free to do some legwork. I understand that it's more difficult than jeering from the sidelines, but it's liable to be more productive.