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If your site is a typical sort of business or institutional website, dmoz strongly prefers to list the home page.
However, "deeplinks" to content pages may be accepted for listing if they add substantial information value to the category and would not reasonably be expected to be found as part of the main site.
Thus, if you have a website for your business that sells supplies for magicians and clowns, dmoz is not interested in listing the individual pages on your site that describe the advantages of your clown wigs, fake noses, and trick playing cards. However, if your website also includes a large collection of freely downloadable slow-motion video clips showing how to do magic tricks, the entry page for that video collection might be considered for a separate listing (in addition to your home page) in a separate category.
Will DMOZ list me three times (under Magic, Fooville and Fumville)? If one of the three entries is edited, do the others update automatically?
And, no, an update to one listing doesn't automatically affect the others.