footpod/'bike speedsensor' speed and distance from custom datafield

Is it possible to access the speed computed by a footpod or bike speed sensor ?

is the speed, mention in the "sensor info" object, the actual sensor speed (footpod/bike speed sensor) or is it also overwritten by the the gps speed(or a smoothed version of the gps speed) ?
why is the distance(incremental distance actually) not part of the sensor info (for footpod/bike speed sensor) ?

thanks