[Lizard]

The correlation between top-down and time is not some rule we meant to impose on our users. It's an observation of how people tend to structure their gantt charts in any app. The primary way for creating dependencies in OmniPlan (dragging arrows) is not affected by the order of your tasks. But we looked at a lot of Gantt charts online, and some our users have sent us, and noted that more arrows point down than up. So we though adding a toolbar that provides a shortcut for the more common use would save some people time.

Grouping milestones at the top of the project is another common practice we saw, but we haven't thought of any specific shortcuts that would help users there.