How do I mark a font as monospaced?
You don’t. Just insure that all the glyphs in the font have the same width and then FontForge will automatically mark it as monospaced for you. (If you mark it as monospaced incorrectly some rasterizers will give strange results). If you want to set a font’s panose values yourself (Element->Font Info->OS/2->Panose) then set the Proportion field to Monospaced. This is necessary but not sufficient to mark the font as a whole as monospaced. If you are unsure whether all the glyphs in your font have the same advance width use Element->Find Problems->Random->Check Advance. When I say “all glyphs” I really mean all glyphs. Even glyphs which unicode says should be 0 width must have the same width as everything else. MicroSoft suggests that GPOS be used to do accent combination (etc.) and then change the advance width on any marks (accents) to be 0.
You don’t. Just insure that all the characters in the font have the same width and then PfaEdit will automatically mark it as monospaced for you. (If you mark it as monospaced incorrectly some rasterizers will give strange results). If you are unsure whether all the characters in your font have the same advance width use Element->Find Problems->Random->Check Advance.
