>> The difficulty is comming up with a mechanism which will connect one 
>> shaft to another if a third shalf is rotating, and disconnect them 
>> when it stops rotating.
> 
> Just get a clutch (like the one in a car) that is controlled by a third 
> shaft rather than your foot.

Does Lego have a part like that? ;-)

> Sorry I didn't explain very well, my idea was that the gates would only 
> update their state when you pushed the rod.  It would be like a kind of 
> master clock for every gate.  You could then have something driving the 
> rod back and to, and the gates would all update on each forward push of 
> the rod.

...so instead of continuous rotational drive, you have continuous 
reciprocating drive, basically?

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