Terrible hackery

gistfile1.el

(eval-after-load 'nrepl
  '(progn
     (add-hook 'nrepl-mode-hook (lambda () (paredit-mode +1)))
     (define-key nrepl-mode-map (kbd "RET") (lambda () 
                                              (interactive)
                                              (if (eobp)
                                                  (funcall 'nrepl-return)
                                                (flet ((nrepl-input-complete-p (&rest args) nil))
                                                  (funcall 'nrepl-return)))))))