According to the critical hit tables, crippled engines just means that the ship's speed is slowed.  Because the house rules allow inertia,<em>Ignomious</em>could still get within firing range, and still has thrusters to turn with, though the ship will drift out of firing range fairly soon.<br/><br/>As for the length of time to repair the engines, why don't you ask the techpriests about that?  XD