The problem is not a bug in the traditional sense, it's more a usability issue.
As you may have been noticed by clicking the last url, there were almost 4500 messages in that page. It's way too much for my users, they would like to have a pager with only 50-100 messages in one page.
Another feature request is to disable threaded view from category view (individual forum), but still have it in the message view (thread).
Template issue should also be easy to fix with a configuration option.
So in short, these features would be nice:
* A pager in the threaded view (configurable size)
* Admin option to disable threaded view separately both in categories and in messages
* Admin option to change default view/function between latest posts, my posts and category list.
Could you please send my requests forward?

Second and third feature request should be easy to implement.