When I click on the scrollbar of a radlistcontrol to go down. The doubleclick event is fired but I don't think it should be fired.

DECLINED: The Rebind method works as expected. This case was logged because ScrollToItem is not working after Rebind and this is due to the fact that our layout system is not synchronous. In order to be able to ScrollToItem, you need to call UpdateLayout first:
            RadListControl1.SelectedItem = itemToSelect
            Me.RadListControl1.ListElement.UpdateLayout()
            RadListControl1.ScrollToItem(itemToSelect)

IMPROVE. RadListControl - SelectedIndexChanged event should fire for multiple selection.

Resolution: 
You can subscribe to SelectedItemsChanged/SelectedItemsChanging events which are fired when the SelectedItems collection changes. The events are added in version Q3 2013 SP1 (2013.3.1127).