InaccurateTorps is a boolean (just checked the scripts).
So 1 in less accurate, 0 is accurate.
The Difficulty parameter (from 0, being the dumbest, to 1 being the most complex, ie. appear smartest), basicly controls the complexity of the AI.
At 0.0 it only uses the "InaccurateTorps" and "DumbFireTorps" AI modules.
At 1.0 it uses the "UseRearTorps", "UseSideArcs", "SmartShields", "ChooseSubsystemTargets", "AvoidTorps", "NeverSitStill", "PowerManagement", "SmartWeaponBalance", "SmartPhasers", "SmartTorpSelection", "DisableBeforeDestroy" and "AggressivePulseWeapons" AI modules.
Other values are just between these.
Difficulty 0.1 means "InaccurateTorps", "UseSideArcs".