When you convert a file a click is required to add the converted file to iTunes. If you are converting a large batch, all of the converted files will be added with the single click.
If you want to configure iTunes to automatically pick up converted files, set the conversion directory in
Digital Media Converter Pro to your iTunes folder with the path ~/Music/iTunes/iTunes Media. As soon as the conversion is complete, iTunes will automatically add your files. If you couple this with Digital Media Converter Pro's
Folder Watcher feature, you can have a end-to-end automated conversion.