sync the everything

First might be possible as part of Online Party Expressions. Second might be possible by looking at the change in velocity, but it would still be a bit complicated.
Either way, I want my next projects to not be related to Online Party sync.

What about syncing all of the other missing visual stuff, some being looking at nearby interactable entities, and leaning when moving sideways?

It might be possible by examining the animation the player is using. There isn't really a variable that says "the other player just jumped."
However, I have been interested in syncing voices, but that has its own challenges from what I can see. It's not being looked into right now.

Is it possible to create a mod that will play sounds when another player is jumping (for example)? I don't think they need to be synced, just code that will client-sidedly append a random sound when player A receives a packet telling them player B just jumped.
I realize I've asked for this before but I'm curious now if it's possible or not since no one has come forth with a mod and since I'm not in the discord I'm clueless if anyone is looking into it.

sync EVERYTHING!

yoshi now you're just going overboard with syncing stuff-