I don´t want them to change anything yet, I would wait for the full version, I have seen Poeni infantry getting killed quite fast with romans all around them, but I´ve also seen them standing very long when the romans couldn´t get behind them. As soon as you get elephants to stand instead of run, their killing speed is way lower. And the movement speeds are just realistic I think, this are trained fighters, at least young men in their best years, they shouldn´t move like grandfathers.
Keep in mind that valour and other things in the demo are not very balanced, how often did you have valour 10 cav in MTW(not talking about generals here)? and even my high-valour SBC have few chances in a head on fight against Triarii, note that people that fall are not necessarily dead, often they stand up again.
I suggest to include a speedbar or wait for the full and see how it is then, don´t rush things just because of a demo with two prepared battles.