@Vaesse - indeed, looking for some way to make a list across devices is on the todo list when I get a chance.
@happydemic - welcome for your first post on MR. I will have a think about your requirement too and how easy that would be to apply.
@teeminghorde - yes I think Add to List Group would be a more useful evolution of "add to all groups", thanks for showing some interest in it.
@Kraftwerk - adding a book to a list will by default not change anything about it in the library. Imagine you had a piece of paper you were writing a list of book names on. Writing the name down on the list does not in any way touch the book in your library.
To keep track of whether you have read a book or not, most often people use either a custom column or a "tag". A tag is just a name that you can add to the comma separated list of values in the "tags" column - most often this is used for genres but you can put virtually any name you like for your own purpose. For isntance some people used to use a + sign as a tag to indicate they have read it, or you can put the word "Read" or whatever you like. Alternatively use a custom column (which is what I do), adding a yes/no column called #read which I then change every time I finish a book.
You can also go further and use goodreads.com to also keep track of books you have read, using the Goodreads Sync plugin to add them to your "read" shelf there. This gives you all sorts of nice statistics and if you choose the ability for "friends" to see what you have read and your reviews etc.
In terms of "what else can the plugin do" - well reading back through this thread should hopefully give you some ideas of how people are using it. A lot of people use it as a convenient way to queue up books to be added to their device (automatically or manually) the next time it is plugged in. You can also specify that books in your library should have a tag or custom column set by adding to a list. So for instance if you wanted to keep track of what books were on your Kindle even when it isn't plugged in, then you could have a "Kindle" list, setup a rule to set a tag value of Kindle when items are added to your list. Or if you had lists for multiple people/devices, you could set values in tags/custom columns based on adding something to a list. People have been very creative in ways to use this plugin
