how do you limit what is shown on form used to edit properties of CCK field

Issue Summary

Hi

I have a CCK field with a drop down list of values.
From time to time these values will need to change.

I will like to offer users who belong to a certain role access so that they can add/edit/remove values from the drop down list.
But I do not want to give these users access to other properties related to the field.

So is there a way based on user roles to only show the "Allowed values list" part of the form used to manage cck fields.

Thanks