Macro Request

Would it be possible to allow the spinfile macro to work for categories field?  (Like it does for the other fields)

This would be really useful, as I can set a specific file for similar projects and just update the 1 .txt file with new categories. Will allow for some testing and refining the category list per project. 

no thats impossible as the categories are special. As you see it is grouped in a tree and has to be like that as it is also used to surf the webpage (clicking sub category links).