As you know, when people's threads get lost in this forum, they like to 'bump' them by adding another post to get it back to the top. My suggestion is that a 'bump' option is added for people who may want to jump-start another discussion on his/her thread but not add another post. But these threads will be in a separate section of the homepage so other threads don't get drowned by all the bumping either.
I also have no idea what the section to be called. Maybe "Bumped threads"?