with news 1.56:
<{d3forum_comment dirname="d3forum" forum_id=1 itemname="storyid" subject=$story.news_title}>

it give us:
1. dirname - as U can see - it's after clear installation
2. forum id - I started a new forum for news comments. It was the first one, so it is the number [wihout any special characters: bracket - (), or commas - "].
3. itemname - stays without changes
4. as the subject I put "$story.news_title" instead "$story.title". It gives me news title (without category) as the subject for my comments and forum.

look on it at: http://www.izba.zgora.pl (soon alternative version on XCHD)