Is it possible to set the mileage on a profile?

There's seems to be an odometer per profile now, but no way to set them.  Two of the most perplexing things about the Garmin Edge units is that there's no way keep track of mileage per bike.  It'd be insanely useful if we could just have custom odometers as data fields.  Maybe there's a Connect IQ app for this?  But why not build it into the profiles?