There have been several changes to the Custom SERP Score settings. As you'll notice, there are 3 tabs:
Weak Sites: These are the SERP Score options from the previous settings. 'Weak Blogs' have been renamed to 'Free Blogs'. A few other options have also been added such as E-Commerce and Files.
My Sites: Here, you can add a list of sites you own. If you are already ranking for a keyword, you can choose to hide or grey out the keyword from your report.
Ignored Sites: Oftentimes, you may wish to override the Weak Site options. Here, you can add specific sites that won't be counted toward the SERP Score.
Additionally, we also made the SERP Score more accurate in detecting forums and removing false positives.