yea it should work single player.. usually u change almost anything in the game if u know the right command.
EDIT: o, i just looked at the link i posted(i dont play mohaa so i didnt look) ,im not shur if thy say but your sapost to put in the cmd with a semicolin in front like this... ;cg_draw fps 1 ,...also im not shur cause i dont play mohaa, but thy may have made a typo.. try it without a space after 'draw' ,like this... ;cg_drawfps 1 ..if that doesnt work use a back slash example- / cg_drawfps 1 (like i said i dont play mohaa other wise i would make more exact suggestions)