assigning to a team

It would be great to see the logic behind a team to see whether it's applicable for a player or not. Basically to attach different scripts to different situations / selections you could use a drop-down menu, have a look at the PopupList on the Wiki.

Another example would be to have two buttons for selection:

 private var teamSelected : boolean = false;
 var player : gameObject;
 function OnGui () {
     if(!teamSelected){
         if (GUILayout.Button(Rect(10,10,70,30), "Team Red")){
              player.AddComponent ("teamRedScript");
              teamSelected = true;
         }
         if (GUILayout.Button(Rect(10,50,70,30), "Team Blue")){
             player.AddComponent ("teamBlueScript");
             teamSelected = true;
         }
     }
 }

You could also do a OnMouseDown on two 3d-models in the scene if you want a more visual style when selecting.

The basics though is to, at a given action, add a component. Have a look at AddComponent in the docs for usage.