@Arnauld. Thanks for posting and using my plugin. Here are my answers to your questions:
1. I tested it myself, and it seems that for some reason clicking is deactivated on your site. I cannot pinpoint why this is happening, but I suspect that some javascript from another extension (plugin/module) is interfering with the clicking ability. I did notice a syntax error message (in Firefox via firebug) about something in the template.js file, but I doubt that that is the cause. What I suggest is to disable all your extensions (that use javascript) and see how my plugin works. Once you get my plugin working, then enable each extension one by one to see which one is causing the interference. There is really nothing in my plugin code that disables or enables clicking, so it must be some javascript conflict.
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.