Ohhh I would suggest you do make a Discord and join the DokiJam server! Even if you don't plan on saying anything, it's nice to see what everyone's up to.
As for your question about updating the game during the rating period, it's only reserved for major big fixes and not features that would change the gameplay. So I don't think changing the stamina system would be allowed, unfortunately. However, I don't think the stamina system is a major issue and you shouldn't need to worry about that!
I hope this helps!