No way to calculate Jupiter's moons' shadows?#32

The api `jupitermoons.e5()` takes a mandatory `earth` argument. This is what one normally needs to compute transits, occultations, or just the visible positions. However, to compute the **shadow transits** and **eclipses**, one would need to set Sun's radius vector to zero (Meeus, p. 315). I don't see how this can be done. Am I missing something? If not, can something be changed to allow that - e.g. ability pass a null `earth` argument, which would be considered as "make range be zero"?