there should be short informations sounds with just the purpose to indicate there's some message in the lower right like serious errors and chat-messages. otherwise they sometimes get lost in a battle.
a sound if a worker-unit has accepted or refused an order to mine, harvest, built is also missing. this could be a simple "yes" or "no", better would be of course "will built" or "not enough stone".
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a sound if a worker-unit has accepted or refused an order to mine, harvest, built is also missing. this could be a simple "yes" or "no", better would be of course "will built" or "not enough stone".