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I need something that for example you can pass in a matrix to it as a parameter and it will automatically modify all the glyphs in the font file. I need to both italicize and embolden a font as well.
Actually I did manage to accomplish this with ttx and the FreeType library. FreeType has methods like FT_Outline_Transform and FT_Outline_Embolden, and with ttx its easy to get to all the glyph data and then recompile it all back into a font file. But the process is slow: 5-10 seconds for a single font. The reason its slow is at least because its dealing with that huge ttx text file.
But since matrix transformations and embolding is so trivial and ubiquitous I can't believe there's not a command line tool already somewhere to do this but haven't found it anywhere. (The complicating factor in automating this is of course the byzantine TT/OT format.)