Support Dual Processors (maybe even up to 4, for dedicated servers)
Support Multiple Monitors (Even if they're hooked to seperate video cards)
Rear-veiw on the second monitor
Map & control interfaces could be brought up on the second monitor
64 player multiplay online, 128 on lan (max)
Deformable Terrain
Support space (like Freespace) Atmosphere/Terrain and Subterrain/Buildings...If you fly far enough up, you reach space.
Voice communication included
Effects
Down to the terrain, weather effects should be tangable.
Rain, lightnight, a tornado, tidal wave, or sunshine.
Water
Lake with a dam: If the dam is blown, the water should rush out, obliterating everything in its path for a certain distance...
Effect ships appropriately, if you slam into a lake at full speed, you're gonna damage or destroy your ship, but if you enter the lake slowly, you can fly around in the water (albiet at greatly reduced speed)
Movement/Combat
On Foot
Basic weapon set, pick up weapons around the level off other players or armouries. Possible envirosuit.
Ground Vehicles
Tracked or Hovercraft types and maybe a wheeled jeep like vehicle for fun.
Anti-Air vehicles, and Ground vs Ground vehicles
Tanks, Srtiliary etc, but futuristic, most with 2 positions available.
Medium Mech: 2 Seater (second position rear turret), Light and some heavy weapons, Average shielding and armour.
Heavy Assult Mech: 3-5 Seater (2nd and 3rd positions rear/side turrets on 2 leg mechs, 4 and 5 top/bottom on 4 leg mech) Heavy Weapons, Heavy Shielding, Heavy Armour.
All mechs restricted to ground movement except the Light mech, which may jump.
Aircraft
Fighter/Interceptor: Space and Atmosphere capable, forward motion required in atmosphere to remain aloft. Medium weapon, sheilds, like pyro, only faster.
Pyro equivilant - Space, Atmosphere and subterrainian capable, submersable also. Anti-Grav ship, no forward momentum needed. Different models could be loaded out with different weapons/shields/hullstrength.
Bomber: Anti-Grav craft, slow, 2 seater w/manned turret, heavy shields, heavy armour, light defensive weapons, extremely heavy secondary payload. Space, Atmosphere capable, not recommended for subterrainian venture (sitting duck).
Capital Ships
Carrier
The most massive craft in the game, aside from space stations
They have multiple mannable turrets, all flight craft can launch from it (large launch bays full of vehicles in docking stations)
Flag/spawn location for team games
Escape pods
Super Heavy weaponry, Super Heavy Shields and Armour.
May be taken over, or destroyed in its engineering section by either detonating the engine core (aka, big boom) or destroying the anti-grav generators, which would result in it crashing (which may or may not completely destroy the craft...a space based carrier would have some other non-fatal disabling)
Should not hover very far above the surface, maybe 4 pyro hieghts.
Land-Based Carriers are smaller than Space based carriers, and they are not interchangeable, they should be able to fire upon each other with their primary weapons (probably a beam weapon of some kind)
Destroyers
Frigates
Heavy Cruisers
The ships should be like a level unto themselves. You'll have to board the ship to destroy its engines from the inside (not to say another capital ship or several bombers can't do it from the outside, but if either are not available...)
Space Stations
Center of focus in a map, huge fortress in space.
Planets
Have planetary defense systems also, mega sheilds and weapons, no armor except on buildings
Capital ships weapons should be used against planet-based installations and other Capital ships.
Game Modes
C&C
Where one player on either team gets a command map that shows where everyone is, and coordinates battle strategy.
Skirmish Mode
If you lag to much to play online, nobody to lan with, then you can play with and against the AI.