I don't think he is doing anything un-intended.
Queuing units to build them in a row has been a feature even in Rome:TW. You queue up four units, the towns builds them after 1,2,3 and 4 turns respectively. Nothing special or fancy.
Susanna/Calapine
Disclaimer: English isn't my first language, so sorry if you meant something else than I thought you do.
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