Is there any kind plugin developer out there who would be willing to create a plugin that would display all the files/folders inside a folder in the viewer pane?
Even though there are other ways of almost achieving the same result as mentioned here [url]Folder Quick View?] it still isnt the same as integrating this into the viewer pane. I have already built up a mental habit of using a quick view hotkey to easily peek into files, zips, etc. and this seems like a great way to keep the workflow consistent.
Not too mention that the viewer pane looks awfully sad when invoking it on a folder
The plugin API doesn't provide a way to write viewer-plugins for folders. (You can have virtual file-system plugins, but they don't affect the viewer pane.)
Even if it did, I think it's a can of worms to try to provide a third file display in the viewer panel. People would expect it to do everything the real file displays can do, work with commands/buttons, etc.
IMO, a better solution would be for Opus to have a mode where, in a dual-display window, just selecting a folder in one file display causes it to be shown in the other file display. (You could then have a hotkey which toggles that mode and the existing dual-display mode at the same time.)