Detected nearby AP's list with signal strength

We have several WAX650S in use in various locations. Some are in dense areas with other AP's from neighbours. While we can "see" this nice list of detected AP's, there's no measured signal strength (min, max, average) that could help with manual channel settings on our AP's. We forced to use a separate device to measure strength, but it would be nice if the AP's could take some signal strength statistics too.