Why make I.S. required? IMO, levels focused on I.S. tend to lack anything more than "Ooh, look what I scripted!" There are exceptions of course, but visuals/gameplay seem to take second place to the plot and scripted tricks. I've been working on and off on a level that's trying to have a good story without letting I.S. get in the way and script-things-up, but I can't even enter that because of the I.S. master race or something?
EDIT: You edited the rules, but the post still says I.S. is required. That threw me off. I'm in.