To squirrellord:
Unfortunately, these require writing a new game engine. Except the first one about heavy cavalry - but then, it's not particularly needed: they already can kill 1-2 infantry a turn, which is not worse than with Size 3 trample.
The last one is actually present: your troops gain supplies from your nearby forts, which decline with more distance from fort. And some nations do get supplies-producing units.
And, of course, fire-and-flee order is present - it's just mostly useless. If you are going to try and make a new engine... well, then we can discuss this. This game was made by 2 people, after all!
