If you run a public instance of YaCy, it would be nice to have a text-box where users could paste URLs which they would like considered for crawls. If this worked with a simple CAPTCHA, a question like, “What is the capital city of England?” for example, that would cut out a ton of spam too. If suggested URLs could automatically be queued in the crawls, that might be nice.
Perhaps this could be implemented in the default YaCy webpage, along with a “Night View”/“Dark” mode.