Disable capslock LEDs light

My friend pointed me to something that worked. He said to install both PCKeyboardHack and KeyRemap4MacBook. PCKeyboardHack allows for remapping capslock, while the other one seems to allow for a lot more remapping. I'm not sure if both are actually required (you might be able to use just PCKeyboardHack), but I installed both just to play with them. Seems to be working well for me.

Use this AutoHotkey script slightly modified from Elliot DeNolf's answer:

~Shift::
    duration := 0
    If (GetKeyState("Shift","p"))
    {
        start := A_TickCount
        While (GetKeyState("Shift"))
            Sleep, 1
        duration := A_TickCount - start
    }
    if (duration < 100) ;Change this value as needed
        if GetKeyState("CapsLock", "T") = 1
        {
            SetCapsLockState, off
        }
        else if GetKeyState("CapsLock", "T") = 0
        {
            SetCapsLockState, on
        }
    Return

If the Shift key is depressed for less than 100 milliseconds and released, it'll toggle the CapsLk key. Any more than 100 msec and it'll act as a regular modifier key.

If 100 msec is too long, choose an appropriate value in the if condition.