I made the following script for 4 rotating disks;
Code:

---

DEFINE disk_ID			skill1;

var disk_pos[4];		// pos disk --> 1 - 12
var end_pos[4];		// in degrees
var disk_is_moving[4];
var solved_puzzle03;

function turn_disk_event()
{
	if(event_type==event_sonar)
	{
		if(key_pressed(280)==on && (cursor_action_pan.pos_x>-200) && solved_puzzle03==0)
		{
			my.enable_sonar=off;
			while(mouse_left==1) {wait(1);}			// wait for release mouse_left button
			disk_is_moving[my.disk_ID]=1;				// disk is moving
			cursor_action_pan.visible=off;			// hide cursor panel
			end_pos[my.disk_ID]=int(my.pan)+30;		// set end pos for ring (degrees)
			end_pos[my.disk_ID]%=360;					// max. 360 degrees
			//
			debug_val[4]=end_pos[my.disk_ID];
			//
			while(my.pan<end_pos[my.disk_ID])
			{
				my.pan+=.5*time_step;
				wait(1);
			}
			my.pan%=360;
			my.pan=int(end_pos[my.disk_ID]);
			cursor_action_pan.visible=on;
			//
			debug_val[5]=my.pan;
			//
			disk_pos[my.disk_ID]+=1;					// set disk pos (1 to 12)
			disk_pos[my.disk_ID]%=12;					// max. 12
			//	
			debug_val[0]=disk_pos[my.disk_ID];
			//
//			check_puzzle_03_event();
			if(solved_puzzle03==0)						// wrong answer
			{
				disk_is_moving[my.disk_ID]=0;			// reset disk
			}
		}
	}
	wait(1);
}

// uses: disk_ID
action disk_act
{
	my.enable_sonar=on;
	my.event=turn_disk_event;
	
	while(1)
	{
		if(disk_is_moving[my.disk_ID])
		{
			my.enable_sonar=off;
		}
		else
		{
			my.enable_sonar=on;
		}
		wait(1);
	}
}

---

Now I have some trouble with disk_pos[my.disk_ID]+=1;.
This value is not updated with 1 every time I click the mouse. It depents on the time I hold the left button down.
I thought I could prevent that with while(mouse_left==1) {wait(1);} but that does not help.
Same thing happens with end_pos[my.disk_ID]=int(my.pan)+30;. Here get the pan.value also a random value depending on how long I keep the mouse button down.
I think that I am doing something wrong in this script, but I don't know what, has anybody an idea???

First things I noticed were

my.enable_sonar=off in the turn_disk_event: I think you need to put a wait(1) before this. because it is also edited in the action, i don't think you need to change it here.

Also, are you sure that the event is being triggered? It's relying on a certain key (280), cursor pan > -200, and mouse_left = 0...

No problem with triggering the event.
The problem is like I described in the last lines of my post.

You could prevent the trigger like this :-
if(event_type==event_sonar && disk_is_moving[my.disk_ID] == 0)

However I am curious how can the counter increase if you have while(mouse_left == 1) { wait(1);}

I think it has to do with your trace function.Is it triggered from mouse_left button ?
Please paste that function too.

while(mouse_left == 1) { wait(1);} simply waits until the mouse button is released and then goes on with the script.
It has nothing to do with the trace function, the problem was that the counter did not increase by 1 but by 3 or 4, and the pan value was also increased with more or less then the given 30..
Problem solved, I had to remove two lines of the script.