Challenge options for clan leaders

Often when i want to set up a challenge, i only have one or two people playing, but i still have to un-select every person who isn't playing. In fact, even when i'm using all of my available players, the people who they are automatically paired with are not correct. Would it be possible to have an option that allows a newly started challenge to have every available space 'vacant' as a default, so that i only need to adjust the box's i need, instead of all of them regardless if i need them or not. When challenging big clans it takes ages and it doesn't need to...Cheers 🙂