A feature I would very much like to see, (as an option under "Settings -> Configure Dolphin -> General -> Behaviour", perhaps), would be for new sub-directories to inherit the icon of their parent. For example, if a directory had the "folder-green" icon, then new sub-directories of that directory would also have the "folder-green" icon.
Thank you for the bug report. As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists. If this bug is no longer persisting or relevant please change the status to resolved.
5 Years, that long? My goodness, how time flies! Still wishing; IMHO it would still be a useful feature.