Key word management - deselect all keywords

When I have been keywording images in my catalogues there have been instances where I delete a keyword. Unfortunately, and unbeknownst to me I have had keywords selected that are hidden in the tree. When I delete a single keyword, the hidden keywords get deleted too.

Sometimes those hidden keywords are entire trees of keywords. I end up deleting large portions of my keyword lists.

Please give us a shortcut so we can clear the select function for all words in the list. A unselect keyword shortcut, it should not be that big of a problem to implement.

Yes, there was another request, but it has been ignored so I am bringing it back up.