The only way I know of, is to do it in Windowblinds under "modify", I could be wrong. Only thing is, if you are only wanting to change fonts in those two areas, then I'd say there is no way, but, if you are wanting to change font's/text for the whole skin, then Windowblinds would be the way to do it, again, I could be wrong.
yup i'm aware that wb can modify font for the whole skin, problem is it can't control font size for individual areas, that's why I looked for a solution in sks.
i think if wb can do it, then sks can do it too since they both made by stardock, maybe i'm wrong
anyway thanks for trying to help