It would be really helpful to be able to choose the interface charts (and multiple interface charts) using area display format instead of lines to step format. For many, it's the easiest on the eyes for reports and presentations.
Either stacking the areas or overlay.
For that matter it would be nice to be able to choose this for any chart. Instead of making tons of charts to choose from, just build a wizard where chart types are available for all that make sense and you go through the wizard to build your chart instead of choose pre-determined ones and then having to add it and edit it to see what options there are.
I've attached a picture of an example in a product we are considering using instead of NPM or Netflow. They are web 2.0 like and really easy to manipulate.