The phpBB sessions table only keeps track of the latest visited page for each session, so you can see it in Who's Online page and ACP Index. Well, the latest visited page is updated only once in 60 seconds. During that interval, the user could be jumping from page to page and you would not see it properly in those reports.
This MOD just touches an IF statement in the whole phpBB session management code to make phpBB update that information whenever the user visits a new page, not only after 60 seconds, so you get more accurate information in Who's Online reports.
Now, I guess you're thinking on a new feature for those reports, so you could click on a user session row and open a new report to view all pages visited by that particular user. But you need to store that information somewhere (and enough resources to do it). The problem is the phpBB sessions table cannot be used for that, you would have to store all page requests made by all users on a different table.
Probably, such a feature would be handy on certain circumstancies. I agree with you on that, but it looks to me it's a completely different MOD.
You could get that information from your webserver logs too, if/when the need arise.
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