How about adding who's viewing a thread?

It should be possible - I'll take a look at the code that lists the members viewing the forum as a whole and see if I can adapt it for individual topics.

UPDATE: it'll require a modification to the underlying session table and the functions that maintain the data. However, if I find a spare 30 minutes over the weekend I should be able to sort it out

I've added it, although the formatting needs a little neatening up. It does work though, and that's the main thing

Sorry about the screwup in the session changes I made which resulted in the site being broken for a while. It's all fixed now though ... I hope!