As it stands right now (1.1.14 for me) RiverCrossing is NOT working. This exists in game but it does not do anything. Perhaps in the future the developers will use it.
Altering unit traits does not work programmatically (meaning lua programming). After you change the unit, some kind of function ...

There's a few things I was trying to do where I discovered the guessed way does not work.

Creating a hero with {type = Fuel, mod = 100} and {type = Speed, mod = 20} works as expected but {type = Range, mod = 2} does not.
Neither do negative numbers.
Funny enough if you mod the units.csv to have ...

@Kerensky

Thank you for your reply it sounds like the DLC code could be useful to some degree.

@dalfrede

While I already knew those from another forum post it's still useful to have them like this. Thank you for that list.

Clarification:

When I spoke about properties and the ones I know, I ...

Straight to the point, I'm interested in a few things:

Q1: Where does the game store the heroes while playing?
Obs: It's lua so it's a table, but ... what's the name of it? To what "super structure" does it belong to (ex.: Player , world, etc)? Is there a difference between how this gets stored in ...