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There's now a simple way of adding custom fields to any ExtendedModel-based object, such as blog posts and users, which it's already been added to in the master branch. It's based on the
admin/util/extended handler, and usage info is in the comments in the handler.
Here are a couple screenshots of custom fields in action:
Note: This needs a database update to create the extended_fields table - I haven't build an upgrade script for this one yet.