Japanese Merchant shipyard queue

[Buck Beach]

I am trying to include into the game a pot full of small merchant ships built between 1942 and 1945. I am setting their delay dates corresponding to their completion dates and placing them at the various shipyards according to history.

All this seemed cool but a problem occurred to me. Is their a better mechanics to utilize the games normal build rate for the shipyard? Is their some way to set up the ships I am including into a sort of queue?

I am an AI only player are their any suggetions how I can better account for the ships inclusion into the game?[&:]

Buck