Found a little workaround. I'm using right now Yanflys Save Core, and setted it on every map as a parallel event to save the game every 10 frames. This gives the feeling of the game permanently saving, the same goes for using potions and other consumables. Also, I've limited the game to one save slot.
It really starts feeling like Ragnarok Online, maybe you've heard about it.
Perhaps your next plugin would be a "permanent saver" or something similar. Probably with excluding some maps where the permanent saving is disabled. ;)
Greetings
P. s. pretty sure there's another way instead of spamming on every map a parallel event to trigger the hidden saving function, but for now it's working and I'm happy.