This would require quite a lot of changes to the QA engine, which has not been designed (for now) to keep track of views. One reason is that every page view requires only a single database query, and keeping track of views would use a second.
Still, you could do it yourself by creating a new database column that counts views, then incrementing that count whenever the page is viewed. Then make sure that column is retrieved in qa_db_posts_basic_selectspec(), add the appropriate logic to qa_post_html_fields() to pass the information to the theme layer, and then make an advanced PHP theme which outputs this information in the web pages in the appropriate location.
