I would love to be able to set up a custom chart that displays a tag based on when the tagged book was marked "read." For example, I have a tag for new releases and I'd love to be able to look at how many new releases I read per month over the year without having to manually check each month. So I'd need to be able to filter the chart to the tag "new releases", then only include books marked as "read" and use the date marked as read to fill the month bins. I know this would be pretty complicated behind the scenes, but it would be a nice addition for v2!