Is it possible to get something like this (Member of Week/Month or Topic of Week/ Month) for 6.2.x?

It's possible but I doubt that anyone will do it for 6.2, because it's a bit outdated and 6.4 will be released soon.<br />The queries would but some load on the mysql database, so it might be a good idea to use the caching mechanism that is introduced in 6.4 for that.