Google directory submission has to be done via the Open Directory Project. Google gets its data from Open Directory Project, which is also popularly known as DMOZ. If you get listed in DMOZ, you will not have to do separate Google directory submission. You will be able to get listed only in Google directory but you will be automatically listed in other popular directories as well by submitting to DMOZ and to answer your question as per new Google policies Google does not look at multiple titles favorably hence it is best to desist from doing so check out web tools you will find more helpful guides in your quest.