I am looking for the same feature: removing a range of time from the diagram.
I am using timing diagrams to represent historical timelines.
Let say I am making the timeline for the history of Venice. In the old times, we have little information on what has happened. Events are scarce and sparse: there are large spans of time with nothing in it. We must scroll a lot before arriving to the next event. And at the same time, there are periods of time dense in events that force us to have a scale letting them space so that we can describe events, and descriptions in notes don't overlap.
With such a scale, events that were far from each other tend to get much farther.
If we could skip completely a time range we wouldn't have to scroll so much periods completely blank, with no event, looking for the next event.
Or maybe we should support the change of scale in the middle of the timeline. But it might be trickier and more confusing.