the 'space orks' and the 'space vikings' both are supposed to use troops, however i have not tried either of them. they should be in the downloads section on this board, though.
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...the green, sticky spawn of the stars
(with apologies to H.P.L.)
someone,
here is another link that deals with the AI using troops. Check out the Aquilaeian, and Orks (both included in the TDM-Modpack) as well as the Vikings (download available in the Mod Archive) for inspiration on troops and transports.
Sorry, I can't answer your other question. I have only done AI so far.