Do you mean: allow the use of the 5-way for navigation? From the K2 user's guide:
Navigating within a Periodical
At the bottom of a newspaper or magazine you will see options for quickly navigating within an issue. When viewing a blog, you will see similar options for navigation.
Previous Article takes you to the previous article when you move the 5-way controller to the left.
View Sections List takes you to the sections list of a newspaper or magazine when you press the 5-way.
View Articles List takes you to the articles list of a blog when you press the 5-way.
Next Article advances you to the next article when you move the 5-way controller to the right.
By default, "View Sections List" for newspapers and magazines is highlighted and when you press the 5-way, a list of the sections will appear. If you are viewing a blog, "View Articles List" is highlighted and pressing the 5-way shows a list of the blog's articles.
To navigate to a particular article within a section or blog, simply move the 5-way controller to underline the article title and press to select. To dismiss this view and return to where you were last reading in the magazine or newspaper, select "Close Articles List" located at the bottom of the screen.
This is presumably controlled by a particular structure for the MOBI (AZW) file, but I don't think this is documented anywhere.
Are the current Calibre news feeds identified as books?