Customizing the metamodel : Diagrams: Creating and modifying : Creating roadmap-style diagrams : Diagram : What is the user allowed to control?
  
What is the user allowed to control?
The user is allowed to control:
The color of phases.
The vertical positioning of projects.
The horizontal positioning of milestones (through milestone date and the scope specified by the start and end date of the timeline).
The size of symbols (though width of projects is tied to width of timeline).
The spacing between projects.
The location of labels.
The paths of dependencies.