Allows rapid adjustment of SteamVR IPD setting for people out of the design range of VR headsets. Just add an entry under "presets" for each user.

IPD_Adjust.py

# IPD Adjust
# Allows rapid adjustment of SteamVR IPD setting for people out
# of the design range of VR headsets.

import json
import time

config = r"C:\Program Files (x86)\Steam\config\steamvr.vrsettings"
# Units for IPD adjustment are in mm.
presets = [
    ("Default", 0),
    ("Example User", 4)
]

data = {}
with open(config, 'r') as fh:
    data = json.load(fh)

print("Current Value: {0} mm".format(int(data["steamvr"].get("ipdOffset", 0) * 1000)))
print("New Value: ")

for i, (preset, value) in enumerate(presets):
    print(" [{0}] {1}: {2} mm".format(i, preset, value))

selection = input("Selection: ")

try:
    selection_id = int(selection)
    if selection_id < len(presets):
        preset, value = presets[selection_id]
        print("Selected: {0}: {1} mm".format(preset, value))
        data["steamvr"]["ipdOffset"] = value / 1000
        
        with open(config, 'w') as fh:
            json.dump(data, fh)

        print("Configuration saved successfully.")
    else:
        print("Selection {0} does not exist.".format(selection_id))
except ValueError:
    print("Selection {0} was invalid.".format(selection))

time.sleep(1.5)