> You could probably miss out the "*", and just have something like:
>
> \MessageStatus{info} % info for everything
> \MessageStatus{fontspec = warn}
> \MessageStatus{fontspec/AREA = err}
> \MessageStatus{/kernel/math/DivideByZero = ignore}
>
> based on a "keys" approach (for example, I think that my suggested
> l3keys could probably manage this, or something similar but
> dedicated).
Ah yes, I hadn't connected the two ideas yet!
That would be perfect.