I just messaged this to someone, so thought I may as well type it here. How to manually subscribe to threads rather than have a setting where it subscribes automatically when you post a reply:
When you open up a thread, you'll notice a blue bar separating the "original post" from the "comments". This bar contains the top "Post Reply" button, the numbers, and a menu called "Thread Tools".
If you open up the "Thread Tools" menu by clicking on it, you'll see a link called "Subscribe to Thread". If you click on this, you'll be subscribed to that thread.
If you click on the link called "Control Panel" at the top of HUKD at any time, you'll see a list of your subscribed threads in order of last post.
Between that box and your reputation list there's a link saying "View all Subscribed Threads". It does just what it says on the tin, and also allows you to manage/delete subscriptions.
You can also get email alerts when someone posts in one of your "subscribed threads", although I'm not sure how to do this and don't have time to go and look in settings (because I'm a bit of a lazy Duck at 10pm). Maybe someone could type a short guide for that and I'll add it in here?
Hope that helps,