Ok I tried and it lockup the engine. With ent_create you can pass a function with the entity, but not with view entities? The function below is just to test if it's working or not.

Code:

---

ENTITY* avatar_onscreen =
{
  type = "default.mdl";
  layer = 20;
  flags2 = VISIBLE; // visible on screen from the start
  flags = VISIBLE;  client_id = camera; // same camera parameters as the default view
  x = 100; // place 100 quants ahead of the view
  y = -45; // 50 to the right
  z = 0; // and center vertically
}

function xyz()
{
  if(value==88)
	{
		// number 88 = blueteam
		ent_morph(avatar_onscreen,"blueteam.mdl");
		
		while(1)
		{
			avatar_onscreen.pan += 5*time_step;
		}
		wait(1);
	}
}

---