Since Jeffry van de Vuurst pointed out that there is a supported way to achieve manipulating SiteMap XML, ISV.config, Entity manipulation, etc. (thanks for mentioning it) and I have some time, I will update the little code snippet I posted in a previous post. Please use this version. Additional information can be found in the new SDK 3.0.4 (ISV Programming Guide).

To run this code you have to reference all the helper classes found in the new SDK 3.0.4 in the sdk samples\isvreadiness sub folder.

CrmService service=new CrmService();
service.Url="http://localhost/mscrmservices/2006/crmservice.asmx";
service.Credentials=System.Net.CredentialCache.DefaultCredentials;
ExportXmlRequest export=new ExportXmlRequest();
export.ParameterXml="<export><entities></entities><nodes><node>sitemap</node></nodes></export>";

ExportXmlResponse entities = (ExportXmlResponse)service.Execute(export);
XmlDocument siteMapXml=new XmlDocument();
siteMapXml.PreserveWhitespace=true;
siteMapXml.LoadXml(entities.ExportXml);
Microsoft.Crm.Sdk.IsvReadiness.SiteMapCustomizer siteMapEditor=
 new Microsoft.Crm.Sdk.IsvReadiness.SiteMapCustomizer(siteMapXml);

Microsoft.Crm.Sdk.IsvReadiness.SupportingItems.SiteMap.SubArea subArea=
 new Microsoft.Crm.Sdk.IsvReadiness.SupportingItems.SiteMap.SubArea();
subArea.Id="nav_sometest";
subArea.Title="Click me for happiness";
subArea.Icon="some.gif";
subArea.Url="/someurl.aspx";

siteMapEditor.AddSubArea("Settings", "Settings", subArea);

ImportXmlRequest import=new ImportXmlRequest();
import.ParameterXml="<import><entities></entities><nodes><node>sitemap</node></nodes></import>";
import.CustomizationXml=siteMapXml.OuterXml;
service.Execute(import);

Please make sure you also add the correct using statements for the web service.

Hf :-)