Vista - Custom WDS Rules

I have these requirements of WDS for a project:

1) I need to be able to add a new location to the user scope rules for WDS
so that it indexes an application specific folder. This folder, at the
moment, contains only text files.

2) This folder *should not* be included in any of Vista's searches from the
shell. For example, if a user does Windows+F, the shell will not search my
app specific locations.

3) I need to be able to query WDS for results from my app specific folder
only.

Here is what I have so far:

private static void SetUpWDS()
{
CSearchManager searchManage = new CSearchManager();
CSearchCatalogManager catalogManager =
searchManage.GetCatalog("SystemIndex");

CSearchCrawlScopeManager crawlScopManager =
catalogManager.GetCrawlScopeManager();

crawlScopManager.RevertToDefaultScopes();

string indexablePath = @"file:///" +
ApplicationConfig.IndexableFolder;

if (crawlScopManager.IncludedInCrawlScope(indexablePath) == 0)
{
crawlScopManager.AddUserScopeRule(@"file:///" +
ApplicationConfig.IndexableFolder, 1, 1, 0);
crawlScopManager.SaveAll();
}
}


So, rather than use the system index, can I create my own? Are there any
obvious solutions I'm missing?

Cheers,

Tim