[Pharo-dev] Annotating instance variables

I saw some interesting reflection progress in Pharo 5. I wonder if there is a feature to rank instance variables. For example, from the browser I want to assign a category "important" to an instance variable, or "possibly useless", etc. for later refactorings. Is such thing "easily" possible now? There is API support from Reflectivity maybe? Cheers Hernán