My viva is coming up, and one of my supervisors is planning to attend. I know that he won't be able to say anything during the viva itself, but I'm a little worried what he might say afterward while the examiners are discussing my fate. He's a good supervisor, and thinks very highly of my work, but he does have a tendency to agree with whomever he's speaking to at the moment. For example, if the examiners were discussing a small potential change to my thesis, I'm afraid his enthusiasm might get the better of him, and he might "volunteer" me to make a bigger change than the examiners expected or even suggest additional experiments which are beyond the scope of my PhD.
Does that scenario seem plausible, or am I worried over nothing? If there is reason to be concerned, I might ask my supervisor not to come, explaining that his presence might "make me more nervous" to avoid hurting his feelings.
If it helps, I'm in a small country which has an academic system very similar to the U.K. I have read Benefits to supervisor presence at viva in the UK?, but my question is a little different since I have a specific concern, and the supervisor in question has already invited himself.