Nice List!!

I'd like to add to the Grandma friendly Post Editor.

Allow editing after the initial 7 days, mainly so I can attach a link on a keyword within the article, that will open up a new article on that subject.

There are two ways I can think of to do this that can alleviate unwarranted editing.

1. The feature is unlocked once a certain reputation score is reached.
2. There is a backward link option. When writing a new post, I have the option to add a link in an older post.

What are your thoughts on this?