That issue is more generic. You can't get weapons and clothes from bodies or box.
Look at this: http://feedback.arma3.com/view.php?id=3493

As I can tell you, the same interpreter schema is used as in old titles, so any code injection into memory will work as it works now. And there's no Battleye to regulate some common scripts on server or commons task memory editor on client.
Alpha doesn't have any cheat protection

This is a alpha, for engine testing. In others ARMA's, there's some missions for S.P that shows you how to play, so I bet ARMA3 will have these tutorials.

I always play with mumble and the game doesn't crash. But mumble in-game interface isn't working, so I don't have fps count and last active users etc.

I'm using last mumble version.

As I know, these attachs is hard to change, as it needs special equips and tools. As centipe told, that change don`t happens on the field

Yep, that's priority.

And there is also a bug when you attach and detach silencer or flashlight many times, and the weapons stop to doing ANY kind of sound for 3rd players ...
I will make a issue about that with 2 videos proofs...