Patterns and anti-patterns with behaviors?

[zopyx (Andreas Jung)]

Related discussion thread:

How to change existing dexterity types and behaviors

Sorry to resurrect a really old thread, but there seems to be no consensus or answer here. Nor has documentation appeared yet. My specific case is a third party add-on that adds a new field with a behavior. However, it defines that field a required field: I want it optional in my implementation. My first hunch is to subclass the schema and change it, so I'm siding with @datakurre here. I will look at IABehavior.setTaggedValue() tho.