Just to be consitent with other ESRI web mapping API's, please add kinetic scrolling (aka inertia scrolling) feature, like the way the map pan move in bing & google maps. When you pan around on the map, the expected behaviour is for the map the continue to slide proportionally to the speed you dragged/panned the map.
When the user drag the map, the map moves smoothly.
When the user release the left mouse button the map does not stop straight, but stops by the power of dragging the map you made.