Well after a few tries i can't managed to resized it properly and automated them :s I must be dumb lol i will check with my engine community. I don't know if it's a hard task for you to implement this but it would change my life xD Nice work so far keep working on this beautiful tool !
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ImageMagick might not be the solution for your problem, or maybe I didn't understand it yet.
That said, version 0.4 made this possible (and I completely forgot to mention it).
In the chargen.ini file, the parameter "export_individual_sheets" does this. Set it to true, and see if that solves your problem.