I can only answer this: Will the people at the OASC not like it if the thing I am trying for is my second choice. For example, if I am colourblind and my first choice was pilot, but I go for WSOp (L) instead?
The answer, if I read the question correctly, is they will not mind. Quite the reverse. If you put down Flt Ops and bust then they would try and pursuade you to open up your choices. If you insisted on a one and only choice then that is all they can offer you or not.
So put down as many options as you would wish to accept but be prepared to be able to discuss why you want to be a scribbly, plod or WSO. All that matters is that you know about the jobs you want to be considered for.