CapsLock does not seem to work as a valid modifier

[hilts-vaughan]

I can't seem to use the hotkey Caps Lock + Shift or anything with Caps Lock. I don't use mine and would prefer to use it as a modifier key. Is there any reason ShiftIt does not support the caps lock key functionality?

[fikovnik]

Do you know about any other app in which you can use caps lock as a modifier? I personally remap caps lock to control (a habit from old sun keyboards).

Looking at /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/Headers/Events.h I do not see capslock:

typedef UInt16                          EventModifiers;
enum {
                                        /* modifiers */
  activeFlagBit                 = 0,    /* activate? (activateEvt and mouseDown)*/
  btnStateBit                   = 7,    /* state of button?*/
  cmdKeyBit                     = 8,    /* command key down?*/
  shiftKeyBit                   = 9,    /* shift key down?*/
  alphaLockBit                  = 10,   /* alpha lock down?*/
  optionKeyBit                  = 11,   /* option key down?*/
  controlKeyBit                 = 12,   /* control key down?*/
  rightShiftKeyBit              = 13,   /* right shift key down? Not supported on Mac OS X.*/
  rightOptionKeyBit             = 14,   /* right Option key down? Not supported on Mac OS X.*/
  rightControlKeyBit            = 15    /* right Control key down? Not supported on Mac OS X.*/
};

On the other hand it seems it is possible to detect it:
https://developer.apple.com/library/mac/qa/qa1519/_index.html

I plan to move to a better library for shortcut recording (e.g. https://github.com/shpakovski/MASShortcut), but right now I don't have any time to work on it. But I welcome contribution :-)