Being able to click and drag tasks vertically would help project managers group tasks together based on departments. This is helpful to see to see what tasks are on the horizon for departments and team leaders can focus preparation much easier.
For example, see below a mockup made in Excel. It's much easier to understand what the teams need to focus on in this kind of Gantt view.
Please consider adding this feature; being able to click and drag tasks vertically helps with overall presentation. thanks.