I agree with this. Some world events aren't relevant with our lives, and some are quite regional but have vast effects. For example, 1997 Asian Economic Crisis impacted my family quite a bit and I have a fond memory of my parents being worried around that time. I wish I could add/edit/remove some of the "World Events"
Just added the ability to copy the world events to your timeline (click "customize"). Then you can then modify/delete them like any other event. As for adding events, you can always create those like you would any other event. Hope that helps!