Regarding this great selelctor,
"Display topics from previous: [All Topics] Sort by [Topic time] [Descending]"
which is seen at the bottom of pages upon each of viewforum.php?f=nnn

Well many users don't have time to browse each of nnn.

Instead they use
View unanswered posts
View unread posts
View new posts
View active topic
etc. global indexes.

Alas
"Display topics from previous: [All Topics] Sort by [Topic time] [Descending]"
regrettably is not found on each of those global indexs, even though
they indeed list the same level of items as viewforum.php?f=nnn do.

Therefore please implement the
"Display topics from previous: [All Topics] Sort by [Topic time] [Descending]"
there too.