Can't find some multiplayer actions' equivalents for scripting

(Reposted because I realized this should be under "Scripting")

I RTFM and couldn't find ways to add client input value or sync objects thru scripting. What's up with that? Thanks in advance.

As writing JavaScript code for a multiplayer game is a very advanced use case, the script API just gives you access to sending and receiving messages, and then you can write your own synchronization code on top of that. That's the approach used in Command & Construct.