The Caps Lock key on the keyboard is one of the least used keys and a pointless one too. Unless you are a person who likes screaming on people, you will agree to the above statement. People generally prefer using the shift button to make the letters upper case. You can instead map it to do more useful functions.
Read more at http://www.tech4every1.com/2014/05/caps-lock-key-shortcut-cut-copy-paste.html