If it's just a small thing could you kindly add total donations as sort option for Member Statistics. But if it would require you to invest a lot of time to do it then just add it whenever you feel like it. Thank you.
Thank you for suggesting this feature, it has now been implemented. We are aiming to include any changes that have been made in a future release (3.7.0).
Change log:
Feature: Add "Top Donors" member stats block (public donations only)