Funny how this topic remains relevant. At the time I wrote my “An Alternative Directory Tree” article (mentioned by @jinsight above ) I had missed this thread, which had started just days before mine. I would never formulate it the way @FromTheEdge did, but I can see why a Mac user may find Windows very off-putting. I got myself tired of the all-too-technical and rather unpractical directory tree approach, so I simply disabled it, replacing with a vertical toolbar.
However, after months of using it, I missed some aspects of the windows directory tree approach. I needed a kind of “local tree” for certain locations - which I solved with my “Alternative Folder Selector” , adding 6 or 7 buttons to this vertical toolbar, all pointing to those folders where I wanted to quickly get a view on its subfolder structure. (I soon moved those buttons to another, horizontal, toolbaar though, because those 7 buttons consumed too much space in my vertical toolbar).
For the moment, I’m perfectly fine with those two solutions combined. I did try to make a vertical toolbar with the most often accessed folder names and make these “expandable” (sort of the perfect combination of both solutions described above) but I gave up - the toolbar has a lot of options, but its “programmability level” is very limited, not to say non-existing. If, however, a dialog could be locked to Opus the way a toolbar can - or be integrated within a toolbar - then it could be done.
But honestly, I have no particular need for such perfection. Directory Opus being in its current state, “two degrees below perfection” so to speak, is more than good enough.