Мы написали о проблеме разработчику и вот ответ:
If you are using the shortcode to display items, then the tags of the item list itself are accepted as shortcode args, and default to what wprss_get_shortcode_args() returns. The high-level display logic - essentially the item loop - can be found in wprss_default_display_template(). Each item is rendered by wprss_render_feed_item() - this is probably what you are looking for. This function applies the filter wprss_single_feed_output to its output, which allows you to change the output of each specific item.
However, the filter functions will not receive parts of the output to re-order, but the whole output altogether. They also will not receive enough data to properly query the item in order to generate their own output that could replace the default. All these functions are found in includes/feed-display.php of the WP RSS Aggregator plugin.
However, this does not include output of Excerpts & Thumbnails, which adds its markup by hooking into the wprss_after_feed_item_title action, which is triggered right after the title is output, but before the meta information. There is no filter to change the output of Excerpts & Thumbnails separately, but I guess it's possible to unhook the wprss_et_display_excerpt_and_thumbnail() function entirely, and hook it elsewhere, such as to the wprss_single_feed_output filter. These functions can be found in includes/feed-display.php of the Excerpts & Thumbnails add-on.
Т.е. в принципе возможно.
