I would find it really helpful if there was a way to know which cookies for a given website (e.g. google.com) do what? The reason behind is that I'd like to be able to keep just the (Google) cookies for login as well as my preferences (such as language, etc.). However, I'd like all other cookies to be removed. The difficulty here is identifying which cookies do what.
@kimedzheeran I don't remember exactly why I utilised an XPC service (its been a while since I looked at the codebase), But I think it was more for privilege escalation. Without it, you would need to enter your password every time to change the Mac address - which is not exactly user friendly.