outerjoin using Row Names as key?

The join operation supports table merging using the table row names as key (using the flag 'keys','RowNames'). This functionality doesn't appear to be available when using innerjoin or outerjoin? Is there a workaround for this (I'm currently considering creating a wrapper function that explicitly adds the rownames to a column in both tables, joins using the column, and then readds the rownames, but I feel this may be fairly slow?)

[Walter Roberson]

duplicates http://uk.mathworks.com/matlabcentral/answers/262818-outerjoin-using-row-names-as-key