This gist add functions to insert lines above and below the current line without changing the current evil state and current point position.

evil-insert-line-no-state-change.el

;; insert one or several line below without changing current evil state
(defun evil-insert-line-below (count)
  "Insert one of several lines below the current point's line without changing
the current state and point position."
  (interactive "p")
  (save-excursion
    (evil-save-state (evil-open-below count))))

;; insert one or several line above without changing current evil state
(defun evil-insert-line-above (count)
  "Insert one of several lines above the current point's line without changing
the current state and point position."
  (interactive "p")
  (save-excursion
    (evil-save-state (evil-open-above count))))

TODO: remove whitespaces on the created lines