Serviio

Sort of a huge thing to implement/resource heavy, but it would be handy.

Sort of a quick and dirty mock-up of what I mean

HI, I don't think I'll be doing this. What exactly you want to change? Some metadata that don't come correctly from the online sources? There will be a few other metadata extractors in 0.5, like Swisscenter, maybe MyMovies etc - which are programs made specifically to manage your media library - you could use those to organise your library and have Serviio import it instead downloading online metadata.