redmine-username-shorten.js

// ==UserScript==
// @name       Redmine Username Shorten
// @version    0.1
// @require    http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js
// @match      http://*/redmine/projects/*/issues*
// ==/UserScript==

(function(){
    function takeFirstName(i, elem){
        $(elem).text($(elem).text().split(" ")[0]);
    }
    $('.author a').each(takeFirstName);
    $('.assigned_to a').each(takeFirstName);
})();