Editor commands to copy selected (marked) text and:
a) Use as Title (replace)
b) Use as Remark (add)
c) Use as Tag (add; routine needed to handle spaces)
Further distinctions are possible (copy or cut, replace or add) but maybe would overload the action.
(Bonus: No need for text selection, if the desired object is only one word. Choice would be the word next to cursor.)
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