The key is to just practice summit until you don't want to play anymore.

"including the infamous door skip that can ruin runs" I like it.

Yeah it's pretty well known. The only moment I've seen it used is in the recent TAS of Celeste () In reflection at the very start and that skips having to get Kevin to get up there.

In case this issue still hasn't been solved, this is an issue with not having the bin folder or the dll's, these can be found in the ghosting mods readme, but I got you right here. https://dl.dropboxusercontent.com/u/58448223/ghostingmoddlls.zip Stick that bad boy in the ghostingmod folder and you shouldn't have any more Engine errors.

After ~1.5 seconds has passed, save load 9 times (depending on how powerful your computer is) without letting the timer progress and the train behind you should be de-synced into the train you are riding.