Mitch,
as other posters have said, you would have to go through the full selection and training proceedure. There is a lot more to it than a 2 week ROIT course at Cranwell. That is the end confirmation stage of a 12 month plus process that starts with passing the full OASC. If you passed OASC, you would under go a lengthy training process on you home RAuxAF unit.
The current ROIT course is in 3 phases, and covers the same items as the regular IOT, but delevered in a different way over a much longer time span. A lot of the accademics is done via distance learning. You also have ressidential phases covering basic military skills and leadership. It is not an attendence course, and many fail or drop out of this course. OACTU will not graduate you, unless you reach their high standards.
Contact your local RAuxAF Sqn for details.
Good luck with your application, the Reserve Air Forces (of all types) need good Officers as they become more intergrated with the rest of the RAF.