1. You can use the rotator client API to count the items as they are scrolled into view. For example if the scroll direction is left, you increase the current item number by one, if the scroll direction is right - decrease by one. You can do this by using the OnClientItemShown event.
2. You can do this with the InitialItemIndex server rotator property. Set the property to the index of the first item you wish to show (e.g. 5) and the rotator will position this item at the beginning of the viewport.
3. Again you can do that with the InitialItemIndex property. The server OnItemClick event has a reference to the clicked item and its index, which you can use to set the InitialItemIndex.
All the best,
the Telerik team
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