I recommend creating a link within each Node view that pulls up a page displaying bandwidth use of all interfaces on that Node for X days. This would be similar to the Interface Details view which includes min/max/average bps In/Out for X days. This allows for much easier pinpointing of individual bandwidth hogs.
I realize that it is possible to create custom HTML to allow someone to show interfaces on a device for a set number of days, but this requires hours of work and does not easily allow for manipulating the number of days displayed in the graph.
