Hi TimC,

I am new to this board […]

mlf ≠ board.

[…] I would like it to show the title of my post right after my website domain for SEO purposes.

SEO: It's all water under the bridge now. Either a forum contains relevant stuff or not. Search engines don’t have any problems with parameters in the URI. If you don’t believe me, fire up Google and type site:forum.bebac.at. If you have setup your forum recently it will take a while until indexing starts.
BTW, how would you construct a distinct title? Most people don’t alter the subject line (so it will identical for all posts in the thread). Furthermore, there is no guarantee that another post does not exist with the same subject line. Maybe you could construct something clever (subject line, category, timestamp, …) but IMHO, it is not worth the efforts.