Some standard for storing or otherwise representing the keyboard layout in hardware would be nice. Or at least some kind of identifier that says what kind of keyboard it is enough to build a table of the most common layouts.

Hell, while we're dreaming here, it'd be nice to have OS-level support for telling which devices keypresses come from so you can have a different layout on every connected keyboard or even turn extra keyboards into macro pads. (I've seen some setups like this, each with varying levels of jank.)