For the sake of making the Tree follow the order of the flow (not really possible for very complicated flows maybe but fine for simple flows), it would be a nice feature to be able to drag and re-order the Process steps (such as Human Activities, Decisions etc.) so that they represent the order that they actually happen in - rather than just alphabetically which is how they are currently ordered.

An example is shown below of how the sub-items in the tree are in the wrong order due to alphabetic sorting.