Do you mean something like this?

Markup:

<UserControl x:Class="SilverlightApplication18.MainPage"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480" xmlns:igMap="clr-namespace:Infragistics.Silverlight.Map;assembly=Infragistics.Silverlight.DataVisualization.Map.v9.2">

  <Grid x:Name="LayoutRoot">

        <igMap:XamWebMap x:Name="theMap" ElementClick="theMap_ElementClick">

            <igMap:XamWebMap.Layers>

                <igMap:MapLayer Imported="MapLayer_Imported">

                    <igMap:MapLayer.Reader>

                        <igMap:ShapeFileReader Uri="ShapeFiles/usa_st" DataMapping="Name = STATE_NAME; Caption = STATE_NAME" />

                    </igMap:MapLayer.Reader>

                </igMap:MapLayer>

            </igMap:XamWebMap.Layers>

        </igMap:XamWebMap>

    </Grid>

</UserControl>

Code:

public partial class MainPage : UserControl

    {

        private Dictionary<String, Boolean> _allowedNames = new Dictionary<string, bool>();

        public MainPage()

        {

            InitializeComponent();

            _allowedNames.Add("New Jersey", true);

            _allowedNames.Add("Alaska", true);

        }

        private void MapLayer_Imported(object sender, Infragistics.Silverlight.Map.MapLayerImportEventArgs e)

        {

            foreach (MapElement ele in theMap.Layers[0].Elements)

            {

                if (_allowedNames.ContainsKey(ele.Name))

                {

                    ele.IsClickable = true;

                    ele.IsSelectable = true;

                }

                else

                {

                    ele.IsClickable = false;

                    ele.IsSelectable = false;

                }

            }

        }

        private void theMap_ElementClick(object sender, MapElementClickEventArgs e)

        {

            MessageBox.Show("You clicked on: " + e.Element.Name);

        }

    }

Please let me know if you have any questions.

-Graham

As to disabling the hover effect,  the control doesn't currently support this functionality. If you would like to request this feature you could go here: http://devcenter.infragistics.com/protected/requestfeature.aspx