First of all. I am old school FS pilot (from 1997). All features from FSX should be avaible in new FS + of course MANY MORE Which FSX can not give!!!!
Many virtual pilots are waiting for good multiplayer and sharing cockpit feature (in fsx you can do that but without AI-ATC and AI-traffic). It would be nice to fly with friend in same plane in fully AI ATC and Traffic session. Then one pilot can focus on
piloting the plane second take care about systems, nav, comunication, reading sid stars and of course visual observation. Or other scenario- to learn friends to fly in FS because you need to learn rather much.
1. Tools for udating NAV database (after some years some radio aids what you can find on SID STARS plates they are not in FS) for FSX I have found the way how to update FSX via "easynav" and BGL editor but I think that such a tool should be built in into FS
2. Tool for making shared cockpit feature for planes which does not suport shared cockpit. Something to describe all buttons one by one to buttons on clinet side (IP, DNS, etc needed to preform connection)
2. Support for 3rd party stuff (planes/scenery there is many things and it would be rather bad idea to destroy thousends working hours of programists.
a) Scenery: ORBIX, FS GLOBAL/VECTOR & LC Europe FTX, Drzewiecki Design, Flight One should be compatybile (if DTG will make it better then I dont care, but it must so detailed to give posibility to do VFR flights (roads, tunels, radio antena masts, golf fields, churches, railroads etc). If you will instal PLAN G with global vector and FTX norway for example, its so detailed that in plan g I have even small roads near my twon.) PLAN G its nice program for VFR planing. RECOMENDED
b) Planes: A2A, PMDG, Flight One, Feelthere, Carenado should be compatibile
3. Graphic is not so important but PHISICS + PHISICS + PHISICS + PHISICS This is FS not a battlefield or GTA15
4. Track IR support + tuch down/G effects (something like EZCA)
5. 64 bit aplication - to give posilbility to usemore than 4GB RAM
6. VERY ADVANCED ATC with VFR/IFR SID/STARS & HOLDING, ground operations, marshals, traffic regulation (firstway-who when and how) etc
7. Advanced traffic system (something like "my traffic" with posibility for smal AI planes to do training flights over small airfields and more.
8. PLANES: minimum level of detail like A2A, PMDG, Flight One (Majestic Software Dash 8 Q400 - PRO Edition) with full failure simulation generated by pilot foults engine overstresses (for example like A2A C172 warming up/cooling down to rapidly can cause a damage not in the same flight but It can cause damage in future flights)
a) Advanced Visual damage system (not only "CRASH"
b) Colisions with birds cause damages
c) Posibility to walk around plane and in the plane for pre flight inspection and for fun
9. Airline/plane owner - Connection with airhauler, "FS AIRLINES", and FS PASSNENGER. Posibility to run company with friends, career module, ranking for pilots (FS passengers(licences&built in exams like in FSX in learning center, then the players in airline can get the plane for what they have licence).
a) posibility to make a competition in busines between airlines of other players (owners)
b) passengers and cargo should be sensitive for overstresses or bad manoovers (like in fs passengers)
c) All other futures what fspassenger and fs airlines offer.
d) Hanger for planes (look at A2A C172)
e) Players in airline can make flight together is same plane as pilot and CO-pilot in full AI-traffic/ATC world supported (as like in single player). Nice feature would be to give posibility to see other players in that same sesions too. Then small airfields would be filled in with AI planes and more busy with AI + PALYERS because without AI the airspace is very empty. Players can comunicate to each other near and with AI ATC and AI TRAFFIC via ATC menu like FSX has. That is the most important in my opinion, I would brought much better game play.
10. Replay tool where you can place camera where you want to look for your take offs and landings
11. Last place is GRAPHIC. It can not be worse than FSX with FTX's, globals, vectors, REX4, and this
I have tweeked cfg. file to generate more trees and buildings. For strong PC its not a problem. AS gammers say: IF fisx runs with addons and tweeked cfg on MAX HD then every game will run