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Gateway/doorway pages are never a good idea *unless* you know what you are doing. If you take the jump, I'd highly recommend doing it on throw-away domains on free hosts or at least not an IP range/host that's important (i.e. don't try it on a site hosted on the same box/IP address as your important sites!)
Robots.txt won't help you get indexed, it's simply used to limit access by specific SE robots and what pages they can/cannot access. Unless you have pages you don't want indexed or robots you don't want crawling, you don't need it.
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