You can add any unknown word to the custom dictionary, for future use in all subsequent new projects, or you can add it to the project's spelling dictionary, located in a subfolder resources in the project folder. You can use these project spelling dictionaries as client- or subject field-specific spelling dictionaries. (You'll have to copy them manually to a resource folder in any newly created project.)
How about a feature to add spell-checking dictionaries to the Dashboard and Project Templates?
The project-specific dictionaries are now called user.dic, just like the main one in the CafeTran Espresso package.
Would it be possible to rename the project-specific dictionaries to project.dic or client.dic or subject.dic or something like that, to indicate the difference with the user.dic in the CafeTran Espresso package?