Thank you so much for your question regarding our theme SuperMag.
1. Which plugin are you using for RSS feed ? Would you please tell me that you are using plugin or Custom code? So that we can check and find the issues and solutions.
2. What you mean by irritating on the case of Widget ? Is widget appeared weird or other things? Have you edited any code on theme ?
3. In case of pages, you want to display pages, in slider and slider right section ? This theme is specially designed for magazine and blog, so users usually add post and manage all the section from the post in free theme. But in premium version, you can manage slider from category and make your custom slider.
Please have a look here to know the difference between free and pro version.