I have this same issue happen ALL the time. It would definitely be helpful to figure out a way for people to sign up a friend, without adding them to their family.
The other issue to bring up along similar lines of adding a friend is often times we have church-wide events which involve people wanting to sign up and sit at a particular table, or do an event with a specific leader, or see who is currently signed up at that table - so they can BE with their friends.
It would be revolutionary for F1 to design a weblink ability for people to see the first and last names only of people signed up in a specific room, group, table, event etc. This would help weblink - and online registrations to become so much easier for the ministries and people involved in creating leader and group assignments after people register.
Our other event (vacation bible school) involves over 1,000 people coming to our church to sign up into around 200 groups of kids of all ages. This last year we organized it all manually which is very tedious. If we were able to list leaders, and the kids signed up under the leader and offer a search capability for people to see if and where their friends are registered - it would help alleviate many hours of putting groups together and phone calls, and last minute group arrangements.
Just a thought!
Kristin Jepson