On many sites, logging in will take you to the page you were on before you logged in. If you bookmark the "new posts" page, logging in from there will return you to that page and the "last visit" stamp in the dropdown should be correct.
I just tried that in a fresh browser and it worked. I also tried from a sub-forum page, and logging in took me back to that page as well, so the "back to where you were" part seems to hold. Just start from the "new posts" page and it should behave as you described.
I just tried that in a fresh browser and it worked. I also tried from a sub-forum page, and logging in took me back to that page as well, so the "back to where you were" part seems to hold. Just start from the "new posts" page and it should behave as you described.




















