If I could revise the way keyboards work, they would have another two modifier keys, a Lock Screen key, and a Secure Attention key. Also Num Lock would be removed because the presumption would be that you always want to use the numpad as a numpad.

Would I keep the arrow keys? Maybe, or maybe I would add arrows to hjkl... That might be mean to non-Vim users though (I even still use the arrow keys in Vim, but maybe having Vim hjkl keys would help me learn).

Also Shift+Caps Lock would toggle a Caps Lock Lock that prevents Caps Lock from being toggled.