I don't know whether it is possible already, but I would like Directory Opus to rotate the pictures according the the EXIF metadata orientation.
Specialized Image Viewers like ACDSee are able to do that and I don't know how hard it would be to read out the image's metadata and rotate accordingly.
It's annoying seeing pictures upside down or rotated by 90°.
Preferences has an excellent search filter (which no-one ever seems to use) - try typing "EXIF" into it, there are a number of options to do just what you want.