Burps are definitely a planned feature. “Passing gas” as well. Probably by Alpha 1.0, even. Sweating can probably be done with particles, likely during the low stamina animation or trying to move with a high weight penalty, but it’ll probably be a little before it’s added. Messy eating probably isn’t too difficult for a basic implementation but don’t expect too much and it’ll be while most likely before that’s added.
All of these will be toggleable as usual for anyone who isn’t into it.