Datafield: Instant pace from foot pod with GPS enabled

Hello,

I know that its not possible to make datafield which would overwrite pace from GPS with pace from footpod. But even with GPS on you should be able to get cadence from footpod even with GPS enabled. So it should be possible to make datefield which would calculate pace based on cadence. Of course there would be problem with length of stride which have to calibrated. Maybe it would be possible to make couple versions of datafield with different length of stride? Of course at the end this pace wont be recorded and watch would use GPS pacing but it could be usefull for instant pacing during fast interval training.

What you think?