The list of tags which are allowed in feeds, i.e., which will not be removed by Drupal.

The number of items which will be shown with each feed or category in the feed and category summary pages.

Older news items will be automatically discarded. Requires crontab.

The type of category selection widget which is shown on categorization pages. Checkboxes are easier to use; a multiple selector is good for working with large numbers of categories.