Why is it important to use short names in Plone?
Short names become apart of the URL for Plone sites. Instead of an auto generated URL, you can create an easy to remember URL. For example, say you created a “General Information” page, your URL can show up like this: generalinfo or general-info, as opposed to something like this: 2006-05-11.1561651564.
Also notice how underscores are not used in creating short names. The reason is for functionality: underscores disappear when you email the link (most word processors will format the text to become a URL so it’ll highlight and underline the text), the second reason is because it’s hard to explain to a person what an underscore is. Check out Plone’s road map for more in info: http://plone.org/products/plone/roadmap/73
To enable short name editing, see this article: http://kb.ucla.edu/articles/how-do-you-enable-short-names-in-plone