So is that you could create your OWN lobby. This would only be active if private lobbys. So if you make a map, you could click a "Set custom lobby" button. Then you follow certain steps and boom! And you can make it so others can use your lobby, just friends and yourself, or just you. The steps could be like this.
1: Place a beginning and remove the end.
2: Set a place for you level selecter/open editor area.
3: Select open to all, friends only, or private
4: Publish!