I have added the ability to ignore specific forums and threads to the forum. Here is how you ignore a thread:
1. Open the thread you want to ignore, then find and press the "Ignore Thread" button.
2. The pop-up allows you to choose which locations in the forum that will ignore the thread (click all three if you don't want to see it anywhere).
3. Click "Ignore Thread" and the thread will not be ignored. Next to the "New Posts" tab you can now see "Threads You Ignore" and "Forums You Ignore" (the latter is not pictured in this screenshot). This is where you can see what threads/forums you have ignored just in case.
You can remove ignores by clicking on the thread in the "Threads You Ignore" page and clicking the "Unignore Thread" button. The process works the same for ignoring entire sub-forums.