Java Card Classic projects are only allowed to have a single Java package.

Need an SPI to suppress visibility of the Java Package and Folder templates which can be placed in a Project's lookup, similar to PreferredTemplates, e.g.

public interface getSuppressedTemplates {
    /**Array of paths to templates in the system filesystem**/
    public String[] getSuppressedTemplates();
}

and changes in NewAction to eliminate these templates from those visible in both the New popup menu on packages/folders, and also the New File wizard.

Suppression of templates should be specific to the source directories of the project - i.e. the user should be able to create a new folder in the project root 
- just not in any source directory of the project.