Additional options when adding new key

I was thinking about the option that the "Add new key" dialog could have an expandable "more section" where users could input comment and default language value (if they want to). Currently I find the task of inserting new key in one dialog and then having to locate it in order to give it a default value/comment like something with a room for improvement. The workflow where I can add new key with it's default value and comment would greatly increase my speed of adding translations.

Something like: