First of all i forgot to mention (and wrongly post here...) that i use Arma 3!!
I finally created units (alone, not grouped with others) as team leaders and managed to exclude them!! :)
I also move the main objective trigger to another area (mission purposes) and change the mode to "defend", all this with a trigger and works great!! You can see the units suddenly change tactic and go back to defend the base!
Another good thing is that i "enable" then HETMAN script with another trigger that is been fired not from the beginning of the mission. So i have the ability to "drive" the ai units to do specific thing at the begging and the hetman takes control!
Everything looks working great!
** i use this version --> http://www.armaholic.com/page.php?id=23293
is this the correct one??
Thank you again for the quick respond,
Mike