[Taqwus]

A 'unit factory' (that is, a smaller shipyard that only produces units, not ships/bases) might be saner -- or even, say, specific mine factories, fighter factories, et al.

A full shipyard that can move w/o clearing its queue would be more than a bit abuseable. Even if it can't build while moving, just keep its construction on hold, a shipyard could mostly finish up a heavily-armed Starbase, stop production when it's 1 turn away, cloak, move into enemy territory over a homeworld, uncloak, and resume.

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-- The thing that goes bump in the night