As mentioned, the only changes I see in the Pedigree view is a change in the Marriage information.
Chart/graph views have much of the information size hard-coded so everything fits within the boxes and any drawn lines connect with right boxes. I would not recommend hacking the code.
An alternative to the Pedigree view are the addons Graph View and the very new (and still evolving) Family Tree View discussed here.
New FamilyTreeView Addon - Development - The Gramps Project (Discourse Forum & Mailing List)
Each is highly customizable and have the added benefit that you can scroll and zoom in and out within the view.