Secure Library features, but allow users to modify only certain elements

I am working on creating secure library features that will simlify designs in the future.  I want all aspects of this design to be secure except for the C'bore and depth of this library feature.  As far as I have gotten I can either secure the whole document by tying it to the library feature, or any user can edit all aspects of the feature at their leisure.  Anyone run into a similar situtation and what was your solution?SolidworksGeneral