i think its a bad idea to register to do anything until things are legal federally. you pretty much are blacklisting yourself when you are legally signed up to do anything with weed IMO at this point in time, and even though states are making it "legal" i think its best to stay quiet until things are legal federally.
i have thought about that too myself. i mean fuck it. you wont get caught. if anything its the paranoia that gets you because u know ur doing something illegal. i kinda had that feeling when i first got my drivers license, I thought to myself oh shit this is awesome and felt like butterflies in my stomach(anxiety) and felt like i could still get in trouble. but when i thought, wait i have my license, i cant get in trouble. anyways, back on the weed subject. just because u have a state license doesnt mean that you can't still get busted because its still illegal federally. but we can all safely assume the feds arent gonna bust you if your running a couple lights. also we can assume you wont get busted by the local's if you grow without smell leaking outside and word of mouth getting to the authorities.