Hi BenK ,
We plan to add advanced reports to ATUM Export Pro in the future, but I can't give you an ETA. However, I don't know if that's what you're looking for.
We don't plan to add additional total column calculations to Stock Central in a med term. However, if enough people ask for this feature, we'll consider your suggestion. In the meantime, if it is necessary for you, maybe you should consider hiring a developer to get it working. We're always open to include any hooks you may need in our code.