[NTG-context] Feature Request: define colour in relation to existing colour

Hi, What would it take to extend \definecolor so that: \definecolor[ColourA][ColourB][t=0.5, a=1] defines a new colour (ColourB) based on an existing colour (ColourA)? I know that \definespotcolor[ColourA][ColourB][t=0.5, a=1] works, but it seems like \definecolor would also be a natural

[NTG-context] Feature Request: showframe debugging

Hi, \showframe [ labels=on, measurements=on, color=red, ] Would produce an image similar to the attached, but with the black lines drawn in the specified colour. Using labels=on would show the names of the items that can be changed with \setuplayout. Using measurements=on would show the

<    1   2   3   4