I don't think 'posts today' will have a good use in the statistics. You can use it as reference for yourself, but it doesn't tell much to others because of all the time zone differences (unless you use it as 'posts in the last 24h'). Maybe a better option would be to change the 'posts per day' to the posts per day during the last month or something. That actually shows your current activity, while the 'posts per day' not really does. When you leave the forums, but made many posts before, it will still show a good activity while you're possibly haven't posted once in the last year. The other way around is possible too, signing up for the forums, but starting to post after a good while.