I'd be interested to see, in fact, if Sector Fleet has any discussion of fleet jump doctrine (especially when jumping into a known hostile system).
Also note that if the issue is gravitational presence, the 100D limit is going to be essentially a 'rule of thumb' - since a space station is essentially a hollow shell rather than a big lump of iron, I would imagine you could actually jump a hell of a lot closer to it without it affecting you.
For jump away from 'drop tanks' - mere fractions of a second would normally cover separation distance. A space station is typically within 100D of a planet, but even if it weren't, 50 km from a 500m diameter one might sound far - but that is nothing compared to orbital speeds (i.e. solar orbit). From the standpoint of precipitating dropping out of Jump - a 100 km dia bubble is also nothing compared to the volume of space in a stellar system.
Also note that if the issue is gravitational presence, the 100D limit is going to be essentially a 'rule of thumb' - since a space station is essentially a hollow shell rather than a big lump of iron, I would imagine you could actually jump a hell of a lot closer to it without it affecting you.