Unbind some keys to avoid minimizing the frames by mistake or transposing letters everywhere unknowingly.

(put #'suspend-frame 'disabled t) ;; C-z, C-x C-z
(put #'iconify-frame 'disabled t) ;; s-m

Increase the undo limit from 160 kilobytes to 64 megabytes.

(setopt undo-limit (* 64 1024 1024))