[kanemcgrath]

Mechjeb does a lot of automation for complex maneuvers like planetary transfers, ascent autopilot, target interception, etc.. You can even do a porkchop plot for interplanetary transfer. but lagrange points are not possible in KSP because of the Sphere of Influence Model. and orbital slingshots are not included, I assume because they require an intense bruteforce calculation.

[colechristensen]

Aha ok! Ambition reignited, it's not that it's trivial but it's very possible to simulate these things and there are plenty of valid shortcuts. The "BMW" astrodynamics books I learned a large chunk of it from was published in 1971. "Sphere of influence" is a lot more "things you have to do with pen and paper" than things you're forced to do with modern computers.

[loganmhb]

There’s a KSP mod called Principia which does some kind of n-body simulation in which Lagrange points do exist iirc.