I'm no big fan of Vbulletin, but they do have one feature that I really like. Consider the following:

What I like about it is that the current location is dropped down a level. The location from which I came is the last crumb on the top line. I much prefer to use the breadcrumbs to navigate back to the forum I'm reading posts in rather than using the back button on my mouse because it forces a reload and icon update, so I can see which topics still have unread posts. In Vbulletin, I just click on the last crumb on the top line. In SPF, I need to click on the next to last crumb. Secondarily, topic names can be rather long. I like the idea of having a long topic name on its own line.

Specifically, I'd like to see that last crumb, at whatever depth I'm at, on the second line, whether it's a forum or a topic.

My 2¢…