Currently, "Format Parameters" tab exists in nearly all feature types. This allows users to quickly choose values (usually parameters, attribute name etc), however it often fails to allow for attribute values to be chosen, even those these are valid in most instances.
For instance, the jpeg writer allows parameters to define compression or optimize the jpeg. But you can not use a dynamic attribute value to set these with "Format Parameters". Expose these as "Format Attributes" and then you can pass a dynamic attribute. By not showing these abilities in "Format Parameters" users don't believe they can accomplish as attribute values. Updating these, would then convey some of the true strengths of FME