Probably not. Most of the time I do not find my client's testimony helpful and will not have them testify under oath in person. Frankly, in most cases it will not make any difference or be helpful. Sometimes, I have them testify by declaration and not be present to preclude questions by the hearing officer. There are exceptions of course - such as some refusal cases when we are trying to show that he/she did not refuse. Obviously, this decision is very fact specific.