I think an option for players to look at the game and weapon schemes in online multiplayer would be really helpful to see what you're getting into.
While you could infer most of the game scheme settings from the [Esc] menu in-game, the devil lies in the details. I.e. you don't know the health crate proability until you collect a health crate. Weapon probabilities are very hard to guess, so are crate contents (how much of each weapon).

For room visitors, I suggest this:
Instead of the disabled "edit" button players see an "eye" button which is clickable. When they click the button, they can view at the game scheme and weapon scheme settings (but not edit them, or add new ones; maybe just gray out or hide the “new”/"remove” (etc.) buttons).

By the way: If this were possible, it could become a real problem that the room owner can force-start a game, because a player could be still looking at the schemes and then suddenly the game starts!
A player could still delay the start by not adding a team, but this is more like a workaround for now.