two suggestions:
- Where is my userumber/ID? I just see my Accountname in my account (i want to know if im in the top 20)
- Add the current time/difference or at least the time zone to stats. I am located in Germany and can not calculate anything from the last block creation time, since i am located in a different time zone.
Compare your hashrate to the top 20 list, and you may be able to decipher which one you are.
And, I'm no help for your second question.