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The best addition is Leash, however, which lets you make any alien into your own personal fighting pet. Realistically, most aliens are pretty lousy fighters once the human civs have progressed past basic technology, but it's both useful and fun to have free insta-reinforcements if you need them. Without Leash, it's a long wait for the game to give you anything that isn't Some Blokes, but with it you can have a more characterful army from the off. With the right research, you can also Leash Collosal Aliens, including the mighty Siege Worm. One of several bugs I encountered in this very slightly pre-release code meant I could Leash those guys from the start, but fortunately it was much more a bit of a fun than an unfair advantage.
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