Restrict Activitiy Stream Posts?

Is there a way in Buddypress to restrict activity stream posts and instead have people post their videos/photos/etc. links in their profile instead and have a LINK to it go to the activity stream?

For example, I have created 2 groups - artists and musicians. I want to let anyone register but don't want them all clogging up a stream with endless stuff. I'd rather they post their art and/or music on their profile and then show in the activity feed "Joe Public has added "Mary Had a Little Lamb" to his profile".

Is there something even remotely like that out there?