CS GO command change weaponed hand

Your name within Counterstrike: Global Offensive is tied to your Steam display name. This can be changed. This is discussed in this forum thread, which explains the various methods tried so far to force a name change.

To change your name within Steam, click on the little arrow next to your name in the Steam friend's list and select "Change Profile Name" from the bottom of the menu that appears:

This will pop up the account settings window, which will allow you to change your name. As you've pointed out, this will change your name as you appear to your friends within Steam, as well as in any Steam game that supports it.

You can't get rid of these little shakes when you shoot and aim down to compensate the recoil. It's only possible, when you're using "sv_cheats 1", so it won't be possible in any server. The NiP aim is not smooth as you think. It just looks like it's smooth, because you're a GOTV spectator. On GOTV they turned off this visual shakes, to make it more watchable for a general public. Try, instead, to get used to that. The shakes appears to annoy a little less when you play at 128 tick rate servers. Try that too. Good luck and keep practicing.