Hi Adam,

Guide should be doing that already: it shows the shadows
cast by Jupiter on the moons, and by the moons onto Jupiter,
and by the moons onto one another. (For 'Jupiter', you can
substitute any other planet... including, of course, the shadow
cast by the Earth onto our Moon during a lunar eclipse.) Are
you seeing something different? If so, for which object,
date, and time?

-- Bill