@Arnauld. Thanks for posting and using my plugin. Here are my answers to your questions:
2. It is definitely possible to show only the files. All you need to do is set the right parameters in either the Plugin Manager or as keyword parameters in the article. For example, to show only files, set ‘Show Subfolders‘ to ‘No‘ in the Plugin Manager, or set subfolders=’0′ in the easyfolderlistingpro instance in the article. Sorting is easily done by setting the values for ‘Sort Column‘ and ‘Sort Direction‘.
Hope this helps.