[Zope-dev] Catalog result brains not extendable

I'm trying to get some results from a catalog and add meta_data to it. It seems the only way I can do this using python scripts is by turning the each result object into a dictionary and then adding to that. This is due to the fact that you can't do a setattr on anything using a python script. Why not? Obviously for security reasons but surely there must be a less restrictive alternative than a blanket ban on using attributes on classes?