Hello ree_d , for the standard filebrowser there is no option for deleting. But you can use the 3th party filebrowser delivered with the standard package as well , called mcpuk.
Therefore you must change the fckconfig.js and set the standard filemanager to Mcpuk.
RE: Deleting Folders?
Therefore you must change the fckconfig.js and set the standard filemanager to Mcpuk.