Disabling Sibling Answers on Copy

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I have disabled Sibling Answers on the workspace;however, on the dialog box for Copy Answer it still has the checkbox for "Create Sibling Relationship." Is there any way to remove it from that dialog box too? It doesn't seem editable. You would think disabling the sibling function for answers (per bottom of https://cx.rightnow.com/app/answers/detail/a_id/1111) would disable the ability to do this on copy..?