You'll have to change this within the source code of the script itself. First off, a bot won't ever receive a menu to choose from, and thus won't call the function that handles a menu choice. That means that you'll have to change the part of code that dispatches the menu to all the players. When it loops through all the players, you'll need to emulate a vote choice by directly calling the handling function.
Code:
public plugin_init()
{
new keys = MENU_KEY_0|MENU_KEY_1|MENU_KEY_2
register_menucmd(register_menuid("Which useless choice"), keys, "handleMenu");
}
// Fake menu maker
public dispatchMenus()
{
new iPlayers[32];
new iNumPlayers;
get_players(iPlayers, iNumPlayers);
for(new i = 0; i < iNumPlayers; i++)
{
// if its a bot, go straight to menu choice
// otherwise, show the menu
if (is_user_bot(iPlayers[i]))
{
handleMenu(iPlayers[i], random_num(0,2));
}
else
{
//menu crap
new menu[192];
format(menu, 191, "Which useless choice do you want?^n^n1. 1^n^n2. 2^n^n3. 3");
show_menu(id, keys, menu);
}
}
}
// takes care of menu choice
public handleMenu(id, key)
{
switch(key)
{
// all that other stuff
}
}
Kinda like that. Just don't try to copy paste that cause it doesn't do jack.