Feature Request for expanded sorting within Times Explorer grouping functionality

On the Times Explorer page, when using the grouping feature, I would like to be able to sort data not only INSIDE the groups that I've created, but also to be able to sort the GROUPS themselves.

For example, I've grouped 4 items, which sorted alphabetically, according to the work item title:

I'd also like to be able to specify the sort on hours so these would be listed in the order 2.92, 2.25, 1.25, 0.75.