Re: comint-insert-input on non-command lines:

[Richard Stallman]

    The easiest way to deal with the above problems is to revert Nick's
    changes, which Nick already partly did.  The work that remains to be
    done if we continue this way is to better document the behavior of
    `C-c RET', RET and mouse-2 in Comint buffers.

Let's proceed down that road.  Can you send a patch that would
correct the documentation about this?