There's a ton of educational literature and research that supports self-advocacy of gifted teens. Here are some of my favorite quotes:
"Some students know their needs and interests at least as well as their teachers do, and this is especially true of gifted students."
Delisle, J. and Galbraith, J.
The Gifted Kids Survival Guide: A teen handbook (1996)
"Children with high intellectual ability are especially ready to take charge of their own education."
Karnes, F. & McGinnis, J.
Journal of Secondary Gifted Education, 7, 369-372
"Providing students with choices has been identified as a primary motivational tool that encourages learning."
Gentry, M., & Springer, P.
Journal of Secondary Gifted Education, 13, 192-204
"Self-regulated learning that included choice led to higher self-efficacy and improved academic performance for middle school students."
Pintrich, P. & DeGroot, E.
Journal of Educational Psychology, 82, 33-40
"Counseling for highly gifted students must help them understand their own intellectual achievement and the means to be effective self-advocates within the educational system."
Journal for the Education of the Gifted, 20, 128-37