What about voice recognition stuff? It's become quite advanced lately, there are even some (Japanese) games based solely on it. Of course, this would limit the market to only countries where the native language is english. If you plan to ship abroad, you either need to translate the whole game, or give the voice recognition software some very loose borders.
Example :
Dude from Ukraine is playing your game. English is not his first, second, third or fourth language. He wants to tell some warlord to fuck off.
Mr Ukraine : Ai vant ju to pise of.
Game hears :
Warlord does : Nothing at all.
Mr Ukraine : This game is the pits.