Did you know that you can mod some of the files in the demo Version? The three or four best files are protected from editing, but you can still change "settings.txt" and maybe "systemtypes.txt" and some others.
Try my old (wow, time flies when you're playing an addictive game
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Demo Ablative Armor. You can't mod this file any further under the SE4 demo, though.
Modding rocks! There's nothing like the ability to mold a game into what you want it to be, and SE4 makes it sooo easy!