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It appears there is no way to define sytnax highlighting for package names (other than category "Identifier"). I think there should be, and/or for fully qualified type names (like "java.net.URL" for example). This would (optionally?) also affect the coloring of the seperating dots.
This sounds more like an enhancement to me...
Well, treat it as you like. :) For me it feels like a defect that you can define custom settings for pretty much all kinds of identifiers but not for package names or fully-qualified type names.