Add extra data on mesh import

I am trying to import a mesh from a scientific program. The data is a typical mesh, but along with it, each point (vertice) contains some data such as pressure or velocity. When I import the mesh, is there a good place to import and store the data? Eventually I’d like to have access to the data in nodes.

Never try it but maybe this can help you:
http://www.blender.org/documentation/blender_python_api_2_59_2/bpy.props.html