Speaking from experience, maybe look at getting your student to do an aerobatics rating. It will improve their handling skills, knowledge of the aircraft and how it reacts in different situations.
It was honestly the best thing I ever did and went onto instructing aeros prior to moving on.
In NZ it is quite common place to put training commercial pilots through aeros ratings for the above reasons. Give it a go you may find that it is all the student needs.
