As a complete alternative to Guillaume's correct answer:
You can also use setpref() and the related getpref()
"Note: Preference values are persistent and maintain their values between MATLAB sessions. Where they are stored is system dependent."
These would be per-user.
By the way: I have found in practice that one of the real challenges of preference files is backwards compatibility. "Oh, gosh, a phi of 1.69 isn't even possible now! But if they had that in their preferences file 4 years ago then they must have been doing this kind of analysis and that requires interpreting the other preferences a completely different way...."