Proper standards for "today's web" state that you shouldn't dictate to a user how the link opens. The user can already control this themself by ctrl+clicking, right click -> open in new window, middle clicking, and a number of other options. In fact, in XHTML Strict doctype (which we use) there is no "target" attribute for the anchor tag anymore, so the specifications don't even *allow* you to control this.
Our setting resorts to a javascript method that can be added elsewhere if needed. Realistically, though, your members should be left to make this decision on their own imo.