Totally agree with Seaking but would add:
1. Just a little bit more leg room - so my knees aren't jammed against the seat in front.
2. Enough cabin space to fit your handluggage because quite frankly at present you simply cannot fit your civvy clothes / washbag and towel (as ordered in case of diversion) + your body armour and helmet in a 5kg bag.
3. A service that runs on time! Its not too much to ask considering the fact that you have to turn up 4 hrs before the flight and even longer if you're a pongo who has had to clear through South Cerney first!
However I do think we wouldn't have half the problems we are experiencing if, above all, FSTA had come in on bl**dy time!