Add automatic numeration to groups (1, 2, ...) and to tasks (1.1, 1.2) in a group
At the moment tasks and groups of tasks must be numbered in their name
James Edgar commented
Would certainly be useful where projects are tracked in multiple systems. Number order does not need to reflect task order (i.e. numbers should not change when tasks are re-ordered, inserted or deleted) but the hierarchy (22.214.171.124, etc) should be present and showing or hiding numbers should be a UI option. Currently most of our projects end up with these numbers being inserted by hand, so that documents, wiki pages, development tickets, etc, can all be "tracked back" to a specific task on the overall project.
Lehmon Dekle commented
Not having an easy "line number" feature makes discussing the schedule with others especially difficult, either by phone or even in person. Microsoft Project and other platforms support it. The only down side I see is that as tasks are added or moved, the numbering changes. But from a user perspective, that's not a problem as long as you understand it's going to happen, and a small price to pay for the convenience it brings. This is badly needed for how my company uses the product.