Personally I find it a bit redundant to have to go through my commands and dictate where I want it to continue onto the next line. It also feels redundant to have to store data about each multi-line command on a file in the minecraft directory. There aren't very many scenarios where that would be useful and almost all of them where it is useful has to do with nbt, so I think that there should be an option to just display a command on multiple lines. It is handled exactly as vanilla shows it, no extra dictation of where the next line is as a part of the command, but just client-only reworking of showing the command spready across multiple lines, with possible configuration for how it does that. Pretty much exactly how it is done by better command block ui: nothing extra is added or stored about the command, it is just shown separated and colored depending on nbt depth layer and purpose of each part to a command..