He wants to implement more options to customize your private games.
Like Igor said. Someone once suggested to make a invisible wall in the Cabin to prevent people to jump onto the Uno-Table.
There were people agreeing with this and people disagreeing. To appeal to both parties he suggested to give you the option to decide what you'd like when creating a lobby.
If you like that feature you could turn it on. If not. You could turn it off.
I think that Is a good Idea. I always enjoy a little bit customization. 🙂 But for the Uno example you could also make players half transparent If they jump on the table if you don't want to restrict the area with a invisible wall.