I have an interview with a group of ten on Monday morning. It's in K-12 education and they almost always do group interviews so it didn't surprise me. A friend and former colleague who has been on both sides of the group interview table at least a hundred times strongly suggested that I walk up to each person, shake their hand and individually greet them during the introduction. She thinks it makes a very good impression and creates a connection with each interviewer.
As you may have guessed by me posting this question, I disagree. I've only been on a few group interviews panels but it was my impression that the entire panel was annoyed when a candidate did this. The schedule is tight and it wasted a lot of time which put us behind schedule for the next candidate. If it was only three or four interviewers I would agree but ten handshakes and individual greetings could take four or five minutes.
On another note, I asked her about the stuff in the Group Interview cast and she agreed 100%. She said candidates rarely send thank you notes at all but when one does it's a huge competitive advantage. I served on an interview panel for my boss's job (same job title I'm interviewing for Monday) and we got zero thank you notes or emails from any of the eight candidates and that job started at $95K! Heck, a couple of the internal candidates didn't even wear suites. She said I have nothing to worry about regarding eye contact but she admitted it is a common problem.