Supposed behaviour of the "visible ids" setting

Hi,

I'm currently working on the PLIP to move all control panels in Plone to
use z3c.form/p.a.registry and I was wondering about the supposed
behaviour of the "visible_ids" setting.

On a vanilla Plone 4.2/4.3 it seems this setting does not have any
effect at all. If it is enabled, there is no additional id field on the
edit view of a content object and it is always possible to edit the id
of a content object through the folder_contents view.

So what is the supposed behaviour of this setting? Should we show an id
field on the edit view? Is the current behaviour a bug in Plone 4.x? Do
we want to get rid of that setting in Plone 5/p.a.contenttypes?

Cheers,
Timo

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