It has a purpose and makes for a complete set.
It is better to include it in a set so that it is available when needed.
I'm not sure if I have ever needed to use it.
It is possible that I failed to notice the cursor change when it was employed for a task. I tend to focus more on the task than the cursor most times.
I think so long as there is a use for the cursor it should be included in a complete set. Other people may use/need it.
Have you seen this thread from 2012-13: http://www.rw-designer.com/forum/2390