It's kind of a cheat-mod, but I would like a mod that simply shows what the potential gained or lost affinity would be for each dialogue choice.
Example:
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I think that would be a great idea! [+2.5]
I don't think that would have much of an impact.
I think that is a horrible idea! [-2.5]
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I am by no means a mod creator so I have no idea how easy/hard this would be to implement, but it would be great to have.