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Here is something i came up with,it basically skips all the hdd stuff but i am not sure all of it works, i have not tested this code.
Place this code in the SP folder in your cod4 save data. Start up Cod4 start single player and press select. It should take you straight into multiplayer bypassing the reading HDD. Not sure if it will so don't get angry

Please confirm me if it works or not.
bind button_back "startmultiplayer;wait 200;sv_cheats 1;cg_fov 80;cg_laserforceon 1;g_speed 500;cl_allowdownload 0;sv_allowdownload 0;cl_updateavailable 0;devmap mp_bog"