It's not a distro problem, rather an organisation one, with providing so many different set up support, but this will get sorted
So you need to go through few other steps with the advanced mod rewrite.
I'll post them all here to make it easier.
You'll need this patch
and this one too
(don't worry it is simple, and I'll fix all those in next release
Then apply this post's suggested code changes
(it's basically uncommenting code in sessions.php as suggested in the install).
And last but not least you should install the auto link add on
, and the Advanced mod rewrite patch
(in this one you'll find the rewriterules to use instead as the suggested ones).
This is worth it, then, I am on my way to upgrade and upgrading will be a lot more easy
Once done, go acp and add as many categories and link as you like in the site map index
. As well, you can play with the last topic listing settings to output nice last topic lists in those. As well, you can play with the pagination parameters, allowing you for example to output 50 topic per page in the forum map view while you are using 25 in your true forums.
Take a look at the way I set it up here : http://www.phpbb-seo.com/sitemaps.html