Requested feature overview description.
Have multiple blacklists, each with a name. when searching, you can specify what blacklists to or not to use, depending on setting for that list. (TLDR; multiple toggle-able blacklists rather than one)
Why would it be useful?
Rather than use multiple accounts, browsers, etc, to use different blacklists depending on the situation, eg; if you want to find a post to send to people in a stricter chat than what your usual searches are.
What part(s) of the site page(s) are affected?
Blacklist, settings, and search

I would love this and it would be useful for a lot of things including tag projects. My blacklist is extensive because I get easily annoyed by certain things cluttering up results while just browsing, but sometimes I really do not mind seeing most of that stuff, while I still want to keep certain content blacklisted. And sometimes I want nothing hidden at all (for tag projects). Technically I can just disable the blacklist entirely or the blacklist lines as needed, but it gets tedious if I am browsing through more than one page.