I don't change too much with my Biome config... I can say that when I first started, the config options were really hard to figure out without examples, but I think the documentation has expanded since then. I don't know about your specific case.
I would probably defer to typescript annotations if you want to start setting arguments as optional for a constructor or given methods. I will usually assign a manual default if I want typed behavior. But that will involve adding the TS compiler in addition to Biome, which only partially checks TS.