Be able to hide the groups you are in because really it's nobodies business. I don't mean hide the group tag above your head, I mean when people look in your profile they are allowed to look through all the groups you are in. Just like you choose to say something about yourself in rl/sl section of your profile you should be able to choose to let others see it or not.
I've only been using sl for a couple months so this may already be implemented, but when somebody sends you something you should be allowed to accept or deny not just automatically accept whatever they are giving you.
Also, age verification should be forced not an option. Adult material doesn't have to be posted on the wall's of a sim to still be given to a minor. Just because a sim isn't labled mature doesn't mean there won't be mature things in it.
Thanks
Izzy