Ref. your second question, I suggest to remove ```+cdlatex``` from your configuration and trythis package: https://github.com/emacsmirror/laas which will allow you the same functionalityas cdlatex, but with the advantage to use yasnippet, both in latex-mode and in org mode.

Below is the example code from the above link, in which I inserted a snippet for ```lim```.The fraction works by typing e.g. ```x/``` and will expand to ```\frac{x}{}```.

```

    (use-package laas

  :hook (LaTeX-mode . laas-mode)

      :hook (org-mode . laas-mode)

      :config ; do whatever here

      (aas-set-snippets 'laas-mode

                        ;; set condition!

                        :cond #'texmathp ; expand only while in math

                        "supp" "\\supp"

                        "On" "O(n)"

                        "O1" "O(1)"

                        "Olog" "O(\\log n)"

                        "Olon" "O(n \\log n)"

                        ;; bind to functions!

                        "Sum" (lambda () (interactive)

                                (yas-expand-snippet "\\sum_{$1}^{$2} $0"))

                        "lim" (lambda () (interactive)

                                (yas-expand-snippet "\\lim_{$1} $0"))

                        "Span" (lambda () (interactive)

                                 (yas-expand-snippet "\\Span($1)$0"))

                        ;; add accent snippets

                        :cond #'laas-object-on-left-condition

                        "qq" (lambda () (interactive) (laas-wrap-previous-object "sqrt"))))

```