Using your gait to determine distance traveled.

[Bucyrus]

I would love to see a fitbit watch feature that would allow user to preset their watch by their gait.

That way when you are in a foreign environment, strange city, you could go out for a walk, power walk or run and know the distance travelled.

[JohnnyRow]

That has been available, I think for all models, for many years.

On phone app:

Days of Exercise tile > gear icon near top right > Stride Length

[emili]

your fitbit is intended to capture distance and steps. for more accuracy you can enable GPS which will give you a map of your walk, power walk or run as well. you also set up your stride when you set up your watch. 

[EdmundC]

There's going to be a Zoom conference titled "Estimating Energy Expenditure during Exercise Using Wearable Sensors" in May that will discuss some of these issues.  It's described here BIOMECH-L these people are researchers so it will probably be well worth watching.