It seems like the fonts are pre-built PVR textures in the menu_data folder, so other fonts would probably have to be added to the menu_data folder shipped with GDMENU Card Manager.Proper font rendering is a complex beast. I've started working on my first own Dreamcast project and getting anti-aliased TTF/OTF rendering with full Unicode support and multi-language text-wrapping right and performant is quite the exercise.
I see there have also been updates to megavolt's repo. I guess I'll have a look at integrating those into my fork soon-ish.
