Got it working with function now. Phew. Stupid me. All i had to do was to change my formerly action to a function. And add the action to start the function then

A bit strange though that i need to check the keypressing twice.

Code:

---

function Rotate_me()
{
  while (1)
  		{
		if (key_a)
			{
	  		my.pan += 2 * time_step; 
		}
	wait (1);
  }
} 

action rotate ()

{
	on_a = Rotate_Me();
}   

---