A new release is up. Details at the link. It is not bug free. If anyone else wants to take a look, I’m open to suggestions/fixes, but someone else has already pointed out a different bug on TheBackShed (and it sounds like it might be related to fonts, which is what I think is going on here too), so I suspect the fix might be found in the PicoMite code rather than the PicoCalc customizations.
I may take a look at it again when I get a chance, but for now I’m going to get some sleep.