synonyms & includeOnExport work, but keywordName does not.
Big bummer - please fix ASAP - I have an important client who needs this functionality! - how about next release? or if not, or even in the mean time, how about a status update?
Adobe - Please don't leave us in the dark.
PS - I have validated that keywordName is the correct key - anything else results in a no-op. Specifying keywordName results in an "attempt to index field '?' (a nil value)" error.