It would be nice to have fontmake's -i (interpolate) arg work on VFs or a similar mechanism which only includes a specified list of VF instances.
We're encountering VFs with hundreds of instances. Imo they shouldn't have this many instances since it will wreck application font menus. Instead font devs should be defining these styles using a STAT table.
Of course I can delete these instances in the source file but I will need them when I want to generate static fonts.