Structured comments make it easier to automatically extract information from comments; it does not make it easier to add information.
Comments are so limited, you cannot put meaningful documentation inside them, and by enforcing a rigid structure you are encouraging poor documentation, and making it impossible to write good documentation.
Generally speaking, I find that if a function parameter isn't apparent from the code or its name (prototype, minidoc, etc), then the API is probably stupid and was written by an idiot. I have never seen those situations saved by documentation.