@BR: No reason the server cannot grow an "all metadata view" just like double clicking on the book details panel gives you now. No there's no way to restrict the list of categories in Search (other than using Virtual Libraries). Again not particularly hard to add in the future. I have no plans to add a plugin system for the server, but that does not mean it will never happen. We shall see how much interest there is in the server UI iin the first place. There are lots of other parts of calibre that need love, I've spent a lot of time on this beastie already
