This is a really solid program. Great work! Is there any way we might see a sideways D%? Like, the kind that has the number in a wedge shape along the long edge of the D10. I think Chessex uses this style, if you need a reference.
Currently you can rotate the text, but there's no way to make subsequent characters smaller. I'll try to add that soon-ish. For now you'd have to import SVGs for each face with the exact text shape you'd like to see.