CapsLock and Password

This is a pretty stupid problem to me. All people suffer from it and will be suffering for a long time. Why not to allow both passwords to match: normal and CapsLocked? The only downside in this case is that brute force cracking time is halved. On the other hand, how many (in percentage) create passwords with capital letters! With the exponential complexity growth the register switch does make difference at all. Programmers of secure systems, please, be kind to their users!