It would be handy to be able to copy and paste conversation topics between characters and including sub nodes if you copy the parent of a conversation tree.
This would save a lot of time if you had topics that were universal to characters in a certain area. Then go through and edit slight changes that fits the character manner of speech or slightly different view of the subject.
We can of course copy a character with all that and rename them as a work around. But if you wanted to add new topics down the line, you would have to do a lot of copy characters and delete the old versions of them which could break some tasks that rely upon that character existing. It would be easier to be able to copy and paste new content.