Jared Harbour

Ever want to change the url used to display your posts? This plugin 
allows a blog administrator to change a users url slug from their edit profile page.
The plugin allows for the creation of new author slugs, but also saves old slugs a user has used in the past.

Plugin Name:       Modify Author URL

Allows administrators to modify a users author url from their profile page.

sebastianbarria

Before a slug is created, this function replaces the latin characters with their similar unaccented letter

Slug accent's replacer

Before a slug is created, this function replaces the latin characters with their similar unaccented letter

Plugin Name: Modify Author URL vs Slug accent's replacer