Drew Adams <drew.adams@oracle.com> writes:

 > Hi Mauro,
 >
 > Thanks for looking into this.  I'd completely forgotten about it.
 >
 > I do think that improving completion for Customize thingies could
 > encourage more use of the Customize UI.
 >
 > I think everything you said and suggested sounds good.  I agree about
 > the double-edged sword of the added complexity - not just for the
 > coding but also for users.
 >
 > Parameter-specific completion can really help, but with different
 > kinds of parameters some users might get confused by the different
 > kinds of completion for them.
 >
 > Overall, I think it would be a definite improvement.  And with some
 > completion "frameworks" (and perhaps even with some ~recent vanilla
 > Emacs improvements?) users could maybe get interactive help on the
 > completion possibilities.
 >
 > Anything you find you can do to improve this will be welcome.  Use
 > your own judgment; it'll be fine, I'm sure.

Thanks Drew.

The attached patch is alternative 1: Provide better completion for
Parameter and provide completion for Value when we know the
alternatives.  I think it is an improvement, and it doesn't make the UI
more complex, which alternative 2 does.