One thing might be nice to have in future:
In the module settings of a menu one can choose to start displaying the menu's hierarchy from a specified level on. It really would be great, when XMap would adhere to this setting.
That would improve the narrow shaped hierarchy-structure of Joomla enormously. With this a site admin could structure his site deeper and needn't to have any fears of showing a sitemap - because all menu items that should not be visible won't be shown at all.