The ability to change the time period for the "Matching Events" graph from "last 24 hours" to match the time period chosen for the search would be very valuable. In fact, I think this should be the default. This can help identify baselines, trends, and abnormalities for whatever feature is being examined (for instance, on the Event Log or Syslog search pages).
If this is present, please let me know as I don't see it. The graph completely disappears if searching more than 24 hours. If searching for less than 24 it still shows 24 hours.