Flowchart is a basic connectors for representing the call flow. However i see the existing flowchart template is missing the concept of swim lanes.

Cross functional flowcharts use swim lanes to provide an extra dimension by assigning each process step to a category. Most often the category is a stakeholder (person, role, or department).

Snapping to grid is too rough. I can't move Output pins i.e. on the half of their width. Please, make the grid size scalable

Reverse-engineered classes "remember" path to source files they were re-engineered from and can be "refreshed" automatically or on demand

Feature: If supported source file (C# interested the most) is dropped with the mouse to the model explorer or directly to class-diagram then it is automatically reverse-engineered and added to the diagram.