Additional permission level for users (view & edit SELECTED services and songs)

It would be helpful to have "view and edit SELECTED services and songs" as an additional permission level option. Perhaps a check box within cue lists that designate it full access or selected access. We have different groups using presentation software in the same room at various times (youth group, Sunday services small group) and having one group accidentally edit another group's cue list is a real possibility (and actual occurrence).

Or the Worship Leader can only edit music cues within a given service? OR an admin could lock cues at some point once it is finalized so no one else can make changes after that point.