easy display graphs with N top items (highest values)

When you have a discovered item like ie traffic per port on a network switch it would be nice to be able to create a top 5 graph to automatically show the 5 ports with most traffic on the graph.

Now I used the API to create graphs with all items of the same type but if you have hundreds on a host gives a rather difficult to read graph, often you're only interested in the highest numbers (possibly highest needs to be determined by using calling a function like average/sum/... over the visible time period).