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[current navigator sources] According to the Javadoc, the org.netbeans.modules.navigator.spi.TreeModelSupport allows tree of depth 2 or 3. If a user (of the SPI) needs deeper tree, this class cannot be used and direct implementation of NavigatorTreeModel is required (which is not quite simple). The same probably holds for trees without specified (constant, predefined) depth. It would be nice if the TreeModelSupport allowed the user to simply create model for arbitrary trees.
From my point of view, fixed by the new navigator API placed in the core/navigator.