When studying at standard pace, I usually aim to have about 300 characters due each day. The statistics on the practice page that were introduced some time ago have so far enabled me to target level quite well.
However, the ability to target this figure diminishes day by day as characters and words move to longer-term intervals. This means that the next six/seven days no longer reflect the long-term trend. I may have a long-term trend of averaging 300+ items, but the next seven days only show about 200 items a day as I have already reduced the due numbers by studying at levels below 100% (e.g. 95%).
Thus I would be glad if you could introduce longer-term statistics, e.g. the possibility to show the due statistics for the whole month.