The Subtask area of Task View 3.0 is awesome. It's really powerful.
One thing that would be great, and take it to the next level, would be if we could set custom sort orders and groupings, like we can in List view.
So we could set the columns we want to see, then choose the sort order (for any column, including Custom Fields (as, right now, it's some default ones only)), and any groupings
(Also, an ease-of-use thing: It would also be great if we could rearrange the subtask columns by clicking and dragging, also like we can in List view. Currently, the only way to reorder them is to remove the columns and re-add them in the order you want.)