In the previous version of 1648 and occasionally during development of this version, movement of pikemen was 10-20% slower. Unfortunately, this disadvantages the computer player, because melee units are the ones M2 BAI uses best while cavalry units are normally the ones that give the human player the most advantage. Not only that but if there is a disparity between musketeers and pikemen in terms of movement speed, it can be exploited by the player by taking his musketeers quickly to the flanks of engaged enemy pikemen. And friendly musketeers can escape too easily when attacked by pikemen whereas in actual fact the weight of a musket plus shot and powder equaled or exceeded the weight of a pike. Now you could make them both slow which would still leave the enemy musketeers at the mercy of your cavalry. One solution would be to make also cavalry half as fast. I.e. make everything move half as fast. That would require a whole set of new animations for all types of units. Would everyone like that?
As for the cannon, it is not possible to have stationary cannon in M2. Or rather it is, just that they would never be firing.