Amun Ra does this with their motherships. I'm fairly certain the equation involved doesn't involve deceleration or insertion burns. Those I imagine are more complicated, but mostly doable.I have a suggestion too.
Please add or notify me about the existence of a way to change the fuel requirements for leaving and traveling to planets.
I think that planets like Saturn and Jupiter should require more fuel to leave, and the Moon and the Asteroids should take a lot less fuel to leave. I also wish that you make traveling very long distances should require a very slight increase in fuel cost. Increasing the loading time by 7 to 15 real-life seconds would be nice too, because that isn't so long that you get bored and it is long enough to notice. Basically change the fuel requirement for leaving and time for traveling to planets that have more gravity or are farther from your current position on the solar system map.