an easy way to make your own would be to check if your player is under attack then send a key ( whatever your block key is ) to the game , if you really want to tweak it up i suppose you could also check if your character is in attack so as not to cunfuse the routine.
if you wanted to make it difficult for them to suspect you , put in a delay
if (Foolthem && beingattackedcount > rand(3)+1 )
{
beingattackedcount = 0;
block();
attack();
};
psuedo code not tested but theory is solid.
Little off topic but have you thought of making a mod app for this game? I for one would love to see your expertise put to the game. Granted it may not be as popular as say ARMA 2 but it would still be heavily appreciated.