I think you misunderstand - I'm not really talking about fatigue. Also, in DeI you don't need to press a button - it's just a "fake" button that just shows how resistant to fatigue a unit is, because new attributes cannot be added to the game.
Here's what I'm talking about:
This is an extreme example, and the screenshot is from DeI, but the effect still happens in R2TR from my experiments. Units don't reform and after consistent fighting turn into a blobby mess unless they are "updated" as I said above in my post I linked. In most normal engagements the units will still in a relatively rectangle-shaped block, but the actual units will be completely misaligned and it looks like a rabble. Really, formations should look more like this:
What I'm suggesting in the above posts is a way to achieve that, to make the game better for all mods alike. One of the biggest complaints with Rome 2 is the lack of formations, and although it isn't obvious in vanilla (where battles are so short that you don't notice the units losing formations), it's very obvious in longer battles in mods such as this one, where if any 2 sides are engaged with each other for more than a few minutes they collapse into a formation-less ball. I think I've found out why it happens and how to fix it.
Even if you don't feel the need for improved formations in R2TW or think it's too small a change to worry about, I'd really appreciate the help if you know how DeI manages to force certain abilities to be always-on or if you have any scripting knowledge to tell me how to manipulate abilities in battles. Thanks for reading.