True; and in a good workshop (that doesn't abuse them by dropping them etc.) they're likely to be used often enough to stop them gumming up. For home mechanics that only torque stuff up once in a blue moon the breakaway torque can be significantly off.
Beam wrenches would be my recommendation; Topeak do one that is suitable for lower torques (think it goes up to 8 Nm or so?), and any big one (Draper, Halfords, etc.) should do for BBs etc.
True; and in a good workshop (that doesn't abuse them by dropping them etc.) they're likely to be used often enough to stop them gumming up. For home mechanics that only torque stuff up once in a blue moon the breakaway torque can be significantly off.