We disable and make it depricated ‘Allow HTML Feature’ because to support this feature is very difficult with other options like excerpt length and excerpt_more text, …
At the moment the code (cat-posts.php::allow_html_excerpt(), l.394) is available in the free version and all you have to do is add this filter:
add_filter('the_excerpt', array($this,'allow_html_excerpt'));
But sooner or later we will remove the code from the code. We announced our statement here: http://tiptoppress.com/allow-html-excerpt-feature-will-deprecated-next-4-6-release/
- If you are interested in adding this feature with filters and hooks I can write you a tutorial on GitHub Gist? And I’m interested in your feedback how to use this feature as filter/action hook.