Are you using 4.2 version of the Android. Nexus 7 came out with 4.1 and it should have probably updated now. But pls check if you are running 4.2, only then you can setup multi user. yeah and the different launcher thing . it is possible.
Hit thanks if it helped
Sent from Neo V with Unlocked BL + Trying out the Most customizable yet stable and light Slim Bean ROM for Neo V (previously on Super JB from Harsh, big fan of the ROM) + Fusion 4.5 (Thinking to go back to 4.3 as 4.5 hangs most of the time) + Acid 6.1 (waiting for 7,desperately) + Poweramp