>> Okay, I did not know that there is a strict rule against advice.  Here 
>> is the updated patch, which uses a hook instead.  This makes the code 
>> even more flexible.
>
> Thanks.  A minor nit: every new or modified defcustom should have a 
> suitable :version tag.
>

I'm not sure if I should send a new version of the patch for a minor nit, 
but just in case, here it is.