Dragon Warriors (Dave Morris & Oliver Johnson) has been my favourite RPG for many years, and over that time I've created several small tweaks and house rules for my own games. Some (in google doc form) are provided below.
Sage (V0.1) - A less 'spell-caster' variation on the Mystic profession (using vanilla DW).
I'm also a contributor and editor for "The Nomad Khanates", an unofficial supplement to the Dragon Warriors game, and "The Casket of Fays", a periodic fanzine. Downloadable pdf's available below, as well as at the DriveThru links above.