Nah, no command I typed in did not crash the game instantly so that's good, I just started noticing the corruption when I couldn't save and saw the game stuck, had to end-task it, loading corrupt save gives me a error screen telling me unclearly/generally about something is not existing in the save file anymore, so it's not a damn placebo and is definitely to do with memory size then. Where does one set the memory usage settings for SS anyway? ..ah, nvm, that .bat file. Good grief the values are low, an easy thing to fix hopefully. I have 16gb of RAM, the default values in there are basically for a potato.
Tested WIP 4 again with loading and saving the game like a madman after tweaking the memory values and so far it seems like it saves and loads as it should. I did notice more lag upon when it loaded the game's in-game assets with WIP 4 version and with WIP 3 it's less severe.