Additional Confirmation:
I wrote a new little script that would test out all of the variations of the usb power function. Once I enabled the remote all of them reported values. Here's the script I used for reference:
@title USB Test V10
i = 1
do
sleep 200
a = get_usb_power
b = get_usb_power 1
c = get_usb_power 2
d = get_usb_power 3
print i, ":", a, ":", b, ":", c, ":", d
i = i + 1
until (0)
