Hear me out. This would change everything.
If Minecraft recognized any key that you press, then servers could take this and assign different functions to each key. Want to dash forward every time you press C? Want to open a different inventory every time you press R? The possibilities are endless. It would be different for each server. Some servers might choose not to add any new functions for different keys.
I believe this would absolutely make Minecraft more fun for everyone. Think back to when they allowed servers to have their own resource packs. All it would do is make Minecraft servers more customizable.
I would love to hear what you guys think.