Whenever I attempt to remove a torrent from the list I get this message

"Cannot delete /home/dust/.kde4/share/apps/ktorrent/tor58/: Is a directory"

so I need to go in here and delete the folder with the data by hand.

In the configuration there is a line with "Folder to store torrent information:/home/dust/.kde4/share/apps/ktorrent"

Can I remove this entry? Or how else can I safely remove torrents and data?
I'm running KTorrent 4.1.1 but this has actually been a disturbance for quite a while.

Deleting those tor directories works fine here.

Which KDE and Qt version are you using ?

KDE 4.6.3 and Qt 4.7.3 - all the latest.
Obviously I would like KTorrent to delete the data.

Unless something has changed in Qt 4.7.3 (I'm running 4.7.2), which breaks the function call ktorrent uses to delete this directory, I don't see how this is possible.

The error indicates that KT tries to delete the tor directory as if it were a file.