Please note Expo adjustments DO NOT adjust the transmitter so that a given input makes a smaller difference to output. That is not the purpose of expo.
Expo (Exponential) adjustment simply desensitises the throw around mid stick only. It gives an Exponential curve to the stick input but be warned once you go outside of a given threshold the expo does nothing.
What you require to slow down the inputs (other than practice
) is what's known as dual rates and dual throw.
The Inspire remote does not have either of these adjustments - if it did and people started messing around with them to slow their yaw rates down etc, there would be numerous individuals bellyaching that they could no longer start their motors and not understand why.
It is a wise move on DJI's part not to include these adjustments which are only found on higher end TX's - it would course more trouble than it would be worth especially if they gave you mixes as well.