This game needs a sequel /prequel or need to be set in a different era. Personally, it would be cool to see a Scottish independence war where more weapon options are allowed from small axes to claymore swords and maybe even get your own horse.
Hundred Years’ War, Wars of the Roses or the Tudor dynasty wars would be a better era in my opinion. Scotland clashed with England in all 3 era at different points as I understand it.
Well, Legionnaires was trained with some techniques like make them swim in roaming rivers with rocks hanged on their feet for hours. So I think that could be possible for Roman soldiers.