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The real thing is....
The definition of torque is about having two equal and opposite forces that will cause a system to rotate.... the calculation of torque is the answer of a multiplication...which is the product of the pounds amount and the length of leverage...
but...people are not wrong to say lbs/ ft also , because you can say it in the opposite form, which would be : i will apply "x" lbs PER feet of leverage length. This is where all the confusion comes from.
To conclude...i would say that the exact specific torque value...with or without lube...is a kind of mental masturbation... these bolts have major safety factors so there is no way that any yield strenght would be reached for the difference that oil/grease or whatever else lube would do if you stay in a logical range of torque values...Just make sure you reach that value in an uniform, smooth and constant movement. The main objective is to torque them as less as possible, but as long as they will never come loose on their own.
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