Purple-XD
As I understand things, the system you speak of has already been in place in the RAF for a number of years! Jobs are classified as "flying related" or "non-flying related". The flying related jobs have no restriction on flying pay, but if you are in a non-flying related job then I think flying pay drops to 75% after 3 years (if memory serves right).
The thing is that when the system was introduced it was decided that the vast majority of ground tours were flying related - sims, HQ tours, OEU jobs etc.
I could see that as part of the many current "working strands" being looked at, a rebalancing of what is classified as flying and non-flying related might happen.
The AFPRB Report 2005 is scheduled to contain a major review/overhaul of flying pay.
D4R