You are correct about the KH reforms. They get a (mid range) phalanx unit through MoT only. Not sure about anything else they get.

Both the Sweboz and Romani have reforms. Romans first reform is basically set by date with a slightly earler trigger if you control a few key territories. While Marian is largly based off territory control with an earlier trigger if you can engineer a certain type of leader. The Augustan reforms are purely based off creating the right leader and are the only reforms I have never triggered myself as I am far too lazy to stay with a single campaign that long without winning or giving up.

Sweboz also have a reform, while I have never triggered it I beleive it gives you access to their heavier infantry and cavalry units in their homeland. Not sure what else. Its is not triggered until 190BC and requires some regional development and control, nothing too serious by that date. I have 'won' (read: kicked arse and given up) most campaigns by that stage so have never actually seen what it does.

As for the video's themselves you are right in that your words are limited by your actions and events onscreen, but those are fully under your control and you can edit and shape the video to really show what you want. Not sure I could do it myself, it does take quite some effort to really make a good video.