Of course, there's always the other option of increasing login times:
session_set_cookie_params(2592000);
ini_set('session.gc_maxlifetime', 2592000);
I don't recommend it for production. I do everything on dev --> staging and push to production after quality testing.
But If you really needed autosave, add/activate tinymce for the translation boxes and enable the autosave plugin. Remember to edit in plain text mode and disable saving in html.