First of all, I want to emphasize that File Navigator is a very good and helpful productivity tool. I use it every day. Thanks a lot for that good piece of software :-)
It would be nice and handy to have an option to open a folder from File Navigator in the system's file explorer. That could be done by adding a right click option "Explore folder" or something like that. On a windows box, this would open the folder in the windows explorer. File navigator is a great tool, but sometimes the explorer is more useful, i. e. if one wants to browse images. In the explorer (or other file browsers) users can display these files as thumbnails, slide show etc...
Not sure if this has been suggested already. I browsed the feature requests and couldn't find a similar request.