I have always switched the behaviour, but you can't switch the caps.
Having the Fn on the left appears to be quite an emotional subject for some people.
It's one of things that gave a little bit of Thinkpad identity and there from the beginning.
Having the Fn makes sense and it's OBJECTIVELY* better because on low-light environments it lets you control the screen brightness. In the past you could easily switch the ThinkLight or whatever it was called from a pitch-black room.