You could make a quick plugin. This'll make it whatever's being echoed in echoIntoHead appear in the <head> section of everyone of your admin pages. It's not exactly what you want, but it's a start, and you should look into it yourself. :)
<?php
/*
Plugin Name: Insert bit into head
Plugin URI: http://linktoyourblog.maybe
Description: Plugin to add stuff to the Head in administration
Version: 1.0
Author: You
Author URI: http://You/
*/
function echoIntoHead () {
echo "<meta>This'll be echoed into your administration head tag.</meta>\n";
return;
}
add_action ('admin_head', 'echoIntoHead');
?>
Change the bits at the top of the file, and what's being echoed. Copy it into a new file, and save it in your plugins directory. It'll show up in your plugin's page for you to activate.
That's ugly but took about twenty seconds to knock up. If you wanna make it better, or if you want to learn what it all means, you should check out the writing a plugin article. You'll need to know PHP first though.