This script expands the area that holds the iFrame, in other words, the work area, from 400ish (it tends to vary) to 1200px, for those of us with larger (17" or better) monitors.
Code:
// ==UserScript==
// @name
Fix iFrame height
// @namespace
None
// @version
1.0
// @description
Gawd I hate this...
// @author
ceedj
// @include
*.mturkcontent.com/*
// @include
https://worker.mturk.com/projects*
// @grant
GM_log
// @require
https://code.jquery.com/jquery-3.0.0-alpha1.min.js
// ==/UserScript==
$(document).ready(function(){
$("div[style^='height:']").height(1200);
});