Yes, you can add a yes/no param to a type catalog.
Refer to the attached sample. Rename the .jpg to .zip, then unzip.
I used a sample I already had, and just added a yes/no param to have some fans show the curb, and others without... a bit nonsensical, but I think demonstrates what you are trying to achieve.
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.