last comments first on page and delete threads

1. last comments first on page , really important, and the save button with newest comments first doesn't do anything. Always have to scroll down, choose newest first, despite being saved many times before.

2.delete threads with more than one week no comments added, or sorted at the bottom.

3.too many dead end threads, how do we clean the weeds? some auto cleaning?

4. see all comments on all threads by username

5. search comments by username