Task Management - Due Date changes and reporting

Tasks are difficult to manage in Dentally, the team can change due dates without it being clear on the audit. it would be nice if a due date was changed a reason was added in so we have transparency as to why due dates are being changed. 

Also Task reporting - can I see how many were created, closed on time, overdue - longest wait time etc. at the moment a task is as useful as a note when it comes to performance management which means we use it but trying to manage the team on these tasks is near impossible!