A small contribution to improve the SEO of pages of discussions.
I noted that there is no h1 tag, for title.
In the file:
On line 40, replace with:
<div class="SubTab"><h1><?php echo $DiscussionName; ?></h1></div>
I think need and a style for this h1, do not be tot big.
We've made a similar change in our 2.1 branch.