The component can be enhanced by adding the ability to set default values for a given filter. I bought it thinking that this feature was already present but I was wrong. Too bad because as it is now it is not useful to me.
Consider adding this functionality in future releases. I believe that in Joomla it can be useful for many users to create a JA Megafilter menu item that can display a page showing only the articles (or any other items) already filtered for certain parameters.