You can't ride them, and I'm not sure about petting, but there are animal parks near Sydney where you can feed them. They are drooling fools. Funny animals!
I hate knowing what the rest of the world thinks about Australia
No you can not ride a kangaroo
No you can not get in ones pouch
yes a kangaroo can kill you
yes you can become air borne if a roo kicks you
yes their tails hurt like hell when they hit you and WILL leave a nasty bruise