just now if you want to copy the name of a file you have to edit the file name (right click rename or keyboard shortcut) and then copy it, it would be useful to add the direct option to copy file name(s) with a right or secondary click
also if you want to copy a file multiple times, plasma do not allow it in a bulk or massive way, you need to rename each file one by one
are you talking about dolphin?
bc in dolphin you can just slow click twice (not a double click) on a file name and it will be editable.
also if you turn on the file info window on the right the file name there is accessible for copy
but, you are right that there are no advanced renaming features, you will have to resort to command line and scripts to handle that, unless there is another GUI out there for doing it.
Guess you could make a service for such a thing. Something like:
[Desktop Entry]
Type=Service
X-KDE-ServiceTypes=KonqPopupMenu/Plugin
MimeType=all/allfiles;inode/directory;
Actions=Recop
X-KDE-Priority=TopLevel
X-KDE-Submenu=
#X-KDE-Submenu=
Encoding=UTF-8
Icon=
[Desktop Action Recop]
Name=Recop
Icon=
Exec=cp -r %F $(kdialog --getsavefilename)