Since firmware version 3.2.0 the separate weight and sharpness sliders have been replaced by a single slider that adjusts weight and sharpness at the same time.
The weight and sharpness values for each font are stored in the .kobo/Kobo/Kobo eReader.conf file, and since firmware 3.3.0 the values are in a human-readable format (sharpness values range from -0.4 to 0.2, weight values range from -0.2 to 0.8), so it is possible to set them manually by editing this file.
(In Windows, use an editor that understands unix line breaks such as Notepad++ to edit the file, don't use Notepad.)
Edit: DNSB davidfor and jackie_w beat me to it :-)
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