See
Quickstart: Control templates . You will need to override the
template for the ListView to modify the ScrollViewer properties there. For extensive modification you may need to also override the
ScrollViewer template
and then refer to the modified ScrollViewer template in the ListView template.
The easiest way to do this is to select your ListView in the designer (in VS or in Blend) and chose Edit Template... from the context menu. You can then do the same for the ScrollViewer within the ListView template.
--Rob
