Hi genxer,
Unfortunately, WordPress doesn’t natively track view count or any “popularity” values. So, regardless of FPW, you’d have to use another plugin or tool to make that data available to sort by. The plugin would then also have to make those orderby’s available for other plugins (such as FPW) to use for their own purposes.
Really, you’re looking at some custom work to get FPW to work with another existing plugin that handles tracking the view count and popularity data. There are already plugins that do track that data and probably have a similar widget to FPW for displaying posts ranked/ordered that way.
Sorry I’m not more help on this one.
