The first question that came to my mind, “What happens when it makes physical sense to mount it to the bottom side of the board?”
Yes, and then what happens if the Pot you mount looks like this ? 
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Hello everyone, especially the KiCad symbol library developers. The following is from IEEE 315, Clause 14.2.5 concerning direction of travel of a rotary pot. Note that it says “…travel viewed from knob or actuator end unless…” What this means is that if a pot is attached to the “backside” of the board CW rotation is as viewing the backside of the PCB and not X-ray view.
IAW IEEE 315, Clause 22.4 that is the “official” list of class designation letters, the class letter R is for any type of resistor, whether fixed value, tapped, settable, or variable. The class letter(s) RV is for a symmetrical varistor or voltage-sensitive resistor–NOT a variable resistor.
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