I'm intrigued at the idea of Flt Cdrs and bosses trying to prevent the submission of 'refused' applications, what have they to gain by that?
I think the problem is an aircrew aversion to paperwork (healthy). Most sensible, thinking individuals will look at the programme and will be able to work out for themselves if leave will be possible, if it isn't then they'll save themselves the bother of nugatory admin' by not even asking.