[NTG-context] rscale (only for integers?)

Hi, in a typescript I need to set sansserif font proportional bigger than serif font. Using "rscale"? As far as I have seen this only works when integers are used for bodyfont: \starttypescript [times] \definetypeface [times] [ss] [sans] [helvetica] [default] [rscale=10.2] \stoptypescript \usetypescript[times] %\setupbodyfont[times,10pt] % <- try this ... \setupbodyfont[times,10.1pt] % <- ... and then this \starttext Test \ss{text} \stoptext Unfortunately the sizes for bodyfont and footnotes are specified by publisher (10.1pt and 8.5pt). Is there a chance to get rscale working even for theses decimal fractions? Steffen