O&G Random Movement Questions

Since the rules you mention do not contain any restrictions, they apply to the distance they move, charge, pursue, overrun and flee.

BRB p. 74: "Models with the Random Movement special rule do not have a Movement characteristic, but rather a dice roll, such as D6, 2D6 or 3D6. This is the distance they move, charge, pursue, overrun and flee — they cannot march."