5

From OS X 10.8 to 10.10, I used to modify the PressAndHold keyboard plists to add the new Romanian and Slavic accents and some symbols, so I'm an hyperglot.

/System/Library/Input Methods/PressAndHold.app/Contents

From 10.11, they can no longer be modified.

3

Files in /System are protected by System Integrity Protection. If you wish to edit such files, you will need to disable this.

To disable System Integrity Protection, you can do the following:

  1. Boot into the Recovery HD by restarting whilst holding ⌘R.
  2. Open Terminal (from the Utilities menu).
  3. Run the following command in Terminal:

    csrutil disable
    
  4. Restart.

Source: Disable OS X El Capitan Rootless and permit write actions to System Integrity Protection locations

You can re-enable it once you've edited the file.

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