On Foot Forward Axis Full Range Plus Sprint

[Cliché]

I'm in VR and not using the keyboard. I use the throttle axis for movement, forward and backward. Currently, I have a near infinite speed range between barely moving and running, both forward and backward, and standing still with throttle centered. Rather than pressing a button to enter sprint mode, it would be nice if I started sprinting with the throttle fully forward or backward. Without a custom calibration, this would probably require a full running speed be reached when the throttle is about 80% forward or backward, and then that speed held until the throttle is 95% forward or backward, with sprint mode between 95-100% (or something like that).