BuddyPress.org

Hello, I would like to do the following:

1. Disable friends function: I do not wish my members to contact/interact with each other privately
2. Groups:
a. Only admins who are given permissions can setup groups and they can invite any member in the member directory to the group (does the admin have to add every new member as friend in order to do this?)
b. Members in the group can communicate with each other within the group with @mentions but they cannot add each other as friends, message each other privately or send invites to invite others into the group

Is the above possible? Any help is greatly appreciated! Thank you very much!