Hello, I've got a similar concern, but it is almost the opposite one. Héctor has been very helpful for me in dealing with the recent problem with thumbnails, so I expect that he'd be able to answer both your question and mine in the same response.
I would like to be able to control the control of what posts get shown. Specifically,I would like all posts to be listed in order of popularity, no matter how old they are.
With the way my site is designed I use the posts as information files that I update after the date of posting. Some may be viewed only every few months, but visitors to my site know that the content is there when they see it listed on the side of the screen in the PopularPosts column, and they can read it anytime they want to.
If an unviewed post disappears from the list, then they would not know that it was written and cannot view it.
I have not been able to find the controls over such things. In the ReadMe file I found that the length of time is modifiable, but I did not see how to do that modification.
Thanks in advance, Héctor!!