Dark Ages

So, does this mean you need a short haft, a short-hafted one-handed weapon, and proficiency to use it?

^
I'll need to look into how this will be implemented specifically. For example, attacking with a dagger will require spending Action Points separately. Here... Well, there will definitely be some kind of good bonus.

Another point, are there penalties for movement while wearing armor? How are they expressed?

Medium and light armor – move as you please.
Heavy armor – penalty to Action Points and Attack Points without the Hoplite skill, penalty to Attack Points with the Hoplite skill.