....which only does that one thing. Maybe that would be good enough to allow users to still set the ID field, but not clutter up the properties dialog with two attributes that look similar and confusing to the user.
I think that EXACTLY because ID looks similar to other metadata and may be confusing, we should keep it in the same dialog. The user will then be able to compare tooltips for different fields and actually understand their difference and uses, as opposed to different dialogs which will forever leave him in a state of undecision: "did I change this one the last time? or was it the other one?"
Not to mention that any additional dialogs add clutter. And not to mention that Object Properties already has a keyboard shortcut, while I doubt we can afford a new shortcut for the ID dialog.