The first is when I proposed multiple flavors of Cherry switches being used on a single keyboard.
Sure, what's wrong with that? Like,
reds for pinkies,
blacks for the other fingers, without even hacking the springs. (Heheh, flavours you said.) Or something along those lines...
(When you do get into philosophy class,
gummi domes are literally more "mechanical" than any capacitive or Hall-effect switch, right?)