The Keyboard prefpane trivially lets you map the Caps Lock key to Control. I used that setup for a long time. Are you actually asking to keep Caps Lock around b

The Keyboard prefpane trivially lets you map the Caps Lock key to Control. I used that setup for a long time. Are you actually asking to keep Caps Lock around but map it to Control? I guess that really is tricky, but it never occurred to me as useful, because I never use Caps Lock, so I just happily have two Control keys.