Thanks, dagorhir, I'll take a look.
By the way, I guess the difficulty of the Riding maneuver could also be adjusted by the condition of the battle (weather, terrain, facing wolf-riders,...). That is, a normal battle between two knights, with battle mounts, in a grass plain, could mean an Easy difficulty. But facing goblin wolf-riders on a muddy and stoney terrain, under a pouring rain, could imply a Very Hard difficulty for the Riding Bonus maneuver. Most of the time, however, I guess a Normal difficulty is just fine.