I would like to rollup another rollup field on a related child record.

I know this is explicitly stated in the 'Rollup field Considerations' located here:
https://technet.microsoft.com/en-us/library/Dn832162.aspx

But, I would still like MSFT to explore options to making this happen. Perhaps if we were able to schedule the processing once per day instead of once per hour. I'd be willing to sacrifice tempo for increased functionality.