Mauro Aranda <maurooaranda@gmail.com> writes:

>> I made it a major mode but not derived from it.
>> I've included the Custom-mode options that are useful (as you pointed)
>> and run Custom-mode-hook.
>
> Anyway, I'm OK with this. Maybe we can use derived-mode-add-parents to
> be clear that we consider Custom-mode a parent of this new mode. Some
> comments below:
>
>> * lisp/cus-edit.el (Custom-dirlocals-mode): New major mode.
>> (custom-dirlocals-with-buffer): Move stuffs to
>> `Custom-dirlocals-mode'.
>
> "stuff".
>
>> +(define-derived-mode Custom-dirlocals-mode nil "Custom dirlocals"
>> +  "Major mode for Customize Directory Local Variables in the current directory."
>
> Please mention that it runs Custom-mode-hook too.

Done.