My main grip with calibre is that I can't use my already defined folder structure, so I'm not using it. Unfortunately there is no alternative for managing metad

My main grip with calibre is that I can't use my already defined folder structure, so I'm not using it. Unfortunately there is no alternative for managing metadata including automatic download and batch edition, even as a command line. I sometimes toy with the idea to develop one, but I realise that I don't have the competence or the dedication to do it