Some directories do not appreciate a title that has been stuffed with keywords, instead preferring an 'official' title, i.e., either the company name or the website name. For example, for this site http://www.directorymaximizer.com, the official company title would be 'Directory Maximizer' - note that there are no keywords included.
Since titles act as anchor texts with which your site gets incoming links, there is an option for you to add up to 5 'other' titles. This way you can provide a variety of anchor text options to target different search terms or phrases. The titles that you add will be automatically rotated on each submission, i.e., an equal number of submissions will be made using each title.