Currently, the Pedometer only returns the step count ("number of steps" CMPedometerData field). CMPedometerData also returns other items, like distance and current speed. This would be super valuable for any fitness tracking apps, and prevent any calculations from needed to be done with the Location api. (the fewer client side calculations the better!)
Updating should be as simple as changing this file, 'https://github.com/expo/expo/blob/1844c78d3815558378f201c78554598968e24773/ios/versioned-react-native/ABI35_0_0/EXSensors/ABI35_0_0EXSensors/Modules/ABI35_0_0EXPedometer.m', and changing 'body:@{@"steps": pedometerData.numberOfSteps}]' to just ''body:@{@"pedometerData": pedometerData}]' and 'resolve(@{@"steps": pedometerData.numberOfSteps});' to 'resolve(@{@"pedometerData": pedometerData});'.