Capturing unneeded elements

This plugin usually captures some unneeded elements for me so far. For example it works terrible with scribblehub. If there is even one comment in the comment section the main content is completely ignored and only the comments are captured. When that happens epub starts with the string "Error: Parse Error:".

Even when the main content is captured there are some unneeded elements capture both before and after the necessary content. It would be nice if we can specify which elements are going to be captured or not, preferably by using Xpath expression of the needed elements.