Enhancement to shift skill/assignment

We'd love the ability to add a sub-skill or assignment/task to a shift. The day prior, everyone is assigned a task for their next day's shift. They work on this task while taking inbound phone calls. Currently we have to keep track of this via spreadsheet and email. 

It would be nice to be able to add this to a shift, without having to create a skill for each task. Furthermore, we'd like a certain work group to be able to modify this assignment without having to be a supervisor.