- Caves: On, Off.
Even if you can search "caves" with the search bar, it's a world feature quite important. I personally never join a world without caves and I like to see an option for filter out worlds without them.
- World settings: Default/None, Few (5-), Lots (6+).
I don't like checking all the list of world settings to be sure the host didn't disable bosses, spiders or treeguards, so I'd like to filter out worlds with too many not-standard wolrd setting. I dont like to join a "madness" world when I want to play a "vanilla" one.
Right now you can manually check or workaround to find a server you like, but I think they should be integrated.
These filters might be for "advanced players", but I feel like they are fundamental and a good QOL addition.