I recently ran into a problem when inserting text links into post content, and then updating the target post's slug or changing permalink options - the link in the post content won't get updated.
This is only really an issue if you forget where you've put text links to other posts, and so don't update them.
So I hit on the idea of somehow altering the Link dialogue in TinyMCE to use shortlinks instread of inserting the full permalink:
so example.com/mypage/somepage
would instead be inserted as example.com?p=123
This way the content links wouldn't need updating unless you trashed the target post. Does anyone have an idea on how to acheive this - I was hoping there would be a filter for the page results in the link dialogue?