Very simple way to selectively load family types without bloating with unused types.
In the family editor set up all the types but dont load directly into the project. Instead in the family editor export the Family Types to the same location as the family (it exports the catalog as a simple text file) and save the family before closing.
In the project load the new family and select types from the catalog that pops up
Full article and tutorial at TheRevitKid.
