Full list of join-URL-options like #config.startSilent=true

Hi everyone.

My quick question: Are there more options for configuring jitsi meet’s behaviour when having someone join via URL, like having them start with their microphone muted? I’ve been looking for such a list and couldn’t find any. I’m especially looking for a way to have cameras disabled on startup as well.

My longer question: I want to use jitsi to hold a digital reading, with me as a moderator and my guest reading from their book. I’ll be streaming the event to youtube, but it would be ideal for me if I could have other guests join with just the url, see and hear what me and my guest are saying, but being only able to participate via chat (to ask questions). Is there such a feature?