Manually Editing Of Shortcut Files

When I look into the App, I can see two interesting files:

/Applications/GanttProject.app/Contents/app/plugins/base/ganttproject/data/resources/keyboard.properties
/Applications/GanttProject.app/Contents/app/plugins/base/ganttproject/data/resources/keyboard.macos.properties

I tried to add keyboard shortcuts for scroll.start=shift B, scroll.end=shift E, and scroll.today=shift T since those would be very handy, but after a restart my assignments doesn’t seem to have any effect.
Out of pure investigative motivation, I assigned project.export=ctrl E, and this works perfectly.

Am I doing something wrong? Or is this simply not connected properly?

Thanks, Tobias

Scrolling actions are not plugged into this machinery, sorry.

I suspeced that, what a pity! They should be – it would be very handy.