This isn't exactly what you're asking for, but there is a UI workflow to narrow down the time window around a specific event to see what happened immediately before and after that event in 6.x
Click on the arrow next to the event you want to investigate in "List" view.
Scroll down to the time section of the fields listed underneath the event and click on the _time
You'll get a pop-up with some options to look at events before, after, or near this time. Choose what makes sense.
Search will re-run with your time range in the time picker. If the events you want to investigate are in a separate index or require more keywords/filter terms, you can change that and Splunk will continue looking within that time window until you change the time range in the time picker.
If you want to continue zooming out after this, you can use the zoom out controls on the green timeline.
... View more