I'm fairly certain that was a rule in the last book, too.
The level of complication regarding the exact placement, movement, and angle of feet before and during reloads is going to become so bogged down as to be nonsensical. Just say "feet cannot move during reload" and be done with it. Or get rid of the rule altogether. But having multiple levels of complex yeas and nays for how your support pinky toe can be pivoted during certain phases of the Moon on Tuesdays...