Bit of a nitpick, but I wish there was more certainty to finishing a book. I always change the percentage to 100% and then change the status to "Read", but that doesn't feel right.

I wish there was some sort of thing that lets me say "Hey, I'm done" and let me have some certainty that I finished the book.

Goodreads and MAL have this and I think its a pretty essential, if small, feature.