Is this really the proper use of ModelCHECK? ModelCheck is designed to check a file to see if it meets your company defined standards.
I know you can add things to a file, like the spell check file, and can change parameter values, but adding a designer's name to a part parameter seems to be going too far.
I would use a restricted_text.dat file for the designer parameter and have the person designing the part select their name from the drop down list in the parameter editor. This can also be done at the drawing level.