I was in MB when The Elizabeth Cross was being staffed - about 4 years ago. The RAF took the line that all 'deaths in Service' warranted recognition but this was robustly rebuffed by the Army, in particular, feeling that some 'drunken soldier' killed in a motor bike accident in Hohne has less merit that a guy killed in Helmand/Iraq/*insert campaign. The RAF (and quite rightly in my mind) had a view to formally commemorating those killed in flying accidents, in particular. The staffing looked closely at what was done in WWI and WWII ('Dead Man's Penny, etc) and what our corageous Commonwealth brethren do (ie AUSCANZ)
At the same time, the issue of formal recognition of injuries sustained on operations was discussed, but IIRC there were no formal proposals put forward. It is a bit of a mine-field (if you excuse the analogy) but there is both precedent and need and there was a sense that the discussion was also being conflated with (or at least there was fear of distorting) compensation and litigation issues.
NZWP