Multiple Simultaneous Building/Recruitment

I was just wondering whether it's actually possible to mod the game so that you can recruit multiple units or build multiple buildings at once, but have them still take a certain number of turns (i.e. without going to zero turn recruitment/building). It irritates me how you can't build a barracks and a port simultaneously or whatever, and I think it would make the game much better, so I wondered whether the reason why nobody had done this yet is that it's hard-coded.

Yes its hardcoded. We cant change the system of reqruitment .... much.