Nearly all featuraes are easy to done and, but there are some which are hard to done
1.More units on screen on battlefield/multiplayer. ( No work)
2.Larger game areas (No work)
3.Wind effects everything (clothes, hair ect.) ( use near same teqnigue as clothes)
4.Fire injuries ( simply change character skin)
5.Vehicles ( in halo )
6.Hair animation (use near same teqnigue as clothes)
7.Sweat/ability to get wet ( simply change character skin)
8.Unarmed combat ( as Riddick)
9.Interactive environments ( no work)
10.Blood comes out right places (this feature is in the F.E.A.R., so it`s not too hard)
11.Destroyable environments ( in Red Faction )
12. Co-op ( put players on single player maps)
13.Not perfect skin ( simply change character skin)
14.Chat way it should be ( no hard work)
Then another thing, chat. it should be so that if you want speak all players, text comes to screen. But when you want speak only limited group, they must be near you so they can hear your voice and see your face moves when your game model speaks what you have chatted.
- real weapons, out and indoor environments (no hard work if engine supports outdoor environments, if not there is hard work)
I,Hope you can do this ( if id gives they change the engine )

