The trigger for the Makedonian Reforms is the same as the vanilla Marian Reforms, a Huge city in Italia.
OK, ty.

Thanks for the responses guys, they will be really helpful when I get back to my game comp.
btw, which would you say is better, Hypaspitai or Pheraspidai? I have two of each to try them out against Pontus, but I'd like to get some opinions about them. What are they best used for? That way I'll know if I'm using them wrong or something.
In close melee, I'd take the Hypaspitai, but Pheraspidai are more mobile and have javelins which they are very good at using. They are also cheaper to train and upkeep and can be trained in the second-to-highest MIC (as opposed to the highest MIC, which the Hypaspitai require). So I usually take Pheraspidai, though I sometimes take both for fun.

Are the Samnite Milites/Hastati very good? Theis stats seem to indicate so, but I haven't tried them in a long time, and never the Milites.
I like them. Easy to get and very good. The Milites have an ap Kopis as well, something the stats don't show.

Why doesn't the "effective against armor" trait appear for Thraikoi Peltastai and Dacain Shock Infantry? They use the falcata, which is supposed to be effective at cutting through armor.
The Samnite Milites and Thrakioi Peltastai (along with some other units) do have ap melee weapons, but it is not showed because the game looks at the primary weapon (which is always the missile in missile untis).