yes (below)
you can't get the pc version and use mods there
There are no Action Replays for Xbox 360, BUT there are J-tags. What a J-tag is, its a piece of hardware with modded software in it. You have to open your xbox and manually put it in. Then, you can mod and stuff. I am not sure if you can get banned for doing it or the prices nor even if its legal, i just know they exist and you can buy them
There are no mods on consoles, so the only suits you can get in Arkham City are the ones available as DLC on the marketplace.
you can't because of a bug in the game. If i were you I would download the ultimate universe mod. from www.ultimateuniverse .com it's a great mod and it's for free. don't worry it doesn't contain any virusses.
you cant
you cant
you mod
mod tools can be found below website
you need to mod it. but you could search star wars battlefront ii 212 legion mod and there should be one i used it for myself and its good.
you cant mod ps2 only PC
http://www.moddb.com/mods/star-wars-battlefront-weapons-reloaded-mod
there is none you have to mod
you cant
hoi
yes (below)
there are alot of maps you will like mod maps