What functionality is missing? What is unsatisfying with the current situation?

  Roll function in stat blocks does not automatically calculate and print the average of a given dice roll.  

How does this feature request address the current situation?

  If the feature was added, using 1d6+2 would end up adding 5 before the output of the roll function. The biggest effect would be when using roll for a creatures hp. It would automatically display the average hp roll.  

What are other uses for this feature request?

  This could be used for any part of the roll feature, in adding spells, monsters, characters, etc. It would make it easier and more streamlined if this feature was implemented.