New outliner column: keywords

I’m wondering why, in the outliner, there is (usefully) a column for every piece of metadata, except the keywords? Since the keywords are Scrivener’s “user-definable” metada, it would be quite useful to be able to see and edit them on the fly form within the outliner, even if “organizing” the outline according to them would be disabled due to rational logistical issues.

Keywords, being an array of data, are more difficult to place in the outliner. There is a mechanism for this, but it is unlikely to make it in until 2.0.