OK, I think I understand what you're after now, and as the file list grouping options are not user configurable the only way you'll get what you want is if JRiver add the "Group > Filename (path)" option to the program.
In trying to get you as close as possible, I think I may have come across a bug that is big enough to potentially make the option unworkable for you, so again, you'll need to wait for a response from Matt...
As close as you can get without a filename grouping option:Edit your new playlist based image view scheme like so...
keep the playlist pane as the first pane, and add a second pane. Use the top-most "type" menu to set the pane as a "File Path" pane, and choose an optional base path to use. If you leave the base path field empty, the pane will use "Root" as the starting point.
OK to save you're changes.
Now, When you select a play list in the first pane, the location pane should update to reflect the locations represented in the play list selection. I chose a base path of D:\Pictures and thus far, this is working for me here.
The Big Bug:After making a playlist selection, the location pane to the right of the playlist pane updates to show the paths of the selected playlist, but...
If I now double click an entry in the location pane to enter that directory, the play list pane frustratingly resets to "All" selected.
I've tried making the location the 1st pane and the playlist group pane the second pane and that doesn't help.
The filter in both directions setting has no bearing on this behaviour either.
Back over to you Matt
-marko.