I would put these in the build post but since some are features, I'll make a separate topic:
Let's say I have the Playlists menu open and am nested in a few child items. If I close the Playlists tree by clicking the Playlists down arrow, if I open up Playlists again, the tree has been collapsed again and I have to work my way down the tree again to find out where I was. I have Auto Expand turned off. The tree should be remembered when opening the Playlists again.
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There is no way to find out what size cover images are to determine if you want to find better ones elsewhere. It would be nice to have the File Size and Dimensions displayed just as if the image was imported and you were looking at that by itself. Right now if you hover over the cover art you get a tooltip of the filename. In the simplest solution, add a second line of the tooltip with this information like: 300x298 - 17.5KB. Another solution is to add a header or footer in the Image window with the information of the image name and dimensions.
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In the Library & Folders Options for Fix broken links, there is Yes and Yes (leave network files). What exactly does the leave network files mean?
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It would be nice if the Help button like in Options actually opened Help for that page. Trying to dig through the help for the page you're asking for help on is really difficult. But I'm sure that will come as in most programming, documentation is last.