You just use a hex editor (free ones available at download.com)
Edit nickname.xbn
Here are the codes you can enter.
%action= action button (x usually)
%crouch=crouch (usually right thumbstick moving up and down)
%a-button=A button
%b-button=b button
%use-equipment=b button (melee button)
%rotate-weapons=usually Y
%move= left thumbstick stationary (usually)
%look=right thrumstick stationary (usually)
%primary-trigger=right trigger (usually)
%throw-greande=left trigger (usually)
%right-stick=right stick stationary
%left-stick=left stick stationary
%integrated-light=white button
%zoom=left stick moving up and down (usually)
%x-button=xbutton
%y-button=ybutton
%black-button= black button
%white-button=white button
%dpad-(either left,right,up,or down)=various sometimes A sometimes diffrent
%right-thumb=right stick clicking
%letf-thumb=letf stick clicking
%right-stick=right stick
%left-stick=left stick
%rotate-grenades=black button
%jump=a
%accept=a
%custon-(1-8)=various usually A
Post on XS with same info.:
http://forums.xbox-scene.com/index.php? ... =xbox+name