But you can do that without raising the limit on the GPA.
They already do correct for it. When I was applying to colleges, they all wanted a form from the guidance office that explained the GPA calculation method.
Yes. Our kids’ High School (public) has a maximum unweighted GPA of 4.0 but it gets weighted by some formula for honors classes (up to some limit per quarter) such that the maximum weighted GPA is 4.96. It is a pretty standard thing to do to help discourage avoiding taking more challenging classes.
Nothing to do with grade inflation; that’s a separate issue.
Same here. Was not a grade inflation issue at all in our school, but more credit for taking harder classes. We had a 1.2 multiplier for honors classes, so an A was 4.8, B was 3.6, C was 2.4, D was 1.2 and F was 0. I’m not entirely sure what the theoretical maximum GPA was, as everybody was required to take classes that did not have an honors track like gym and typing. So 4.8 wouldn’t be the max, but somewhere around 4.75-ish I’d guess.
And for applying to college, I don’t think the nominal GPA made that much of a difference, as I remember class rank (not raw GPA) and ACT/SAT scores being the major factors.
Huh. My college did it, and it had nothing to do with the difficulty of the classes. A=5, B=4, C=3, D=2, F=0 for every class.
It was totally unexpected by us also 
the client was British American Tobacco…