add possibility to link to last page and last post of a topic even after new posts are made

in the current versions of PHPBB we can get a direct link to a post or a page of a topic but if we want to create a link to the last post or page of a topic, the URL wont be "valid" after new posts (or pages) are added. The URL would still "work" but won't point to the LAST post (anymore) or Page.

so the suggestion here is to add some sort of anchor so we could do that without having to change the URL everytime a new post (or page) is added to the topic.

it could be something like this :
URL to last page of topic : mysite/viewtopic.php?t=123&start=lastpage
URL to last post of topic : mysite/viewtopic.php?t=123&start=lastpage#lastpost

thanks