I have seen the same thing. mouse_spot (A7 pro lite-c) has no effect on the cursor hot spot if mouse_sync is set on and the cursor is of the correct size for DirectX. My cursor is 64x64 and requires mouse_sync to be off. below is the code I am using for the mouse cursor.

Code:

---

void MouseHandler()
{
   mouse_map = SPEAR1_bmap;	 //flipped image due to bug in mouse_spot.
   mouse_spot.x = 63;	 //mouse_spot still at (0,0) after exicution.
   mouse_spot.y = 3;
   mouse_mode = 2;          // show the pointer
   while (1)                // as long as we are in the game
   {
      mouse_pos.x = mouse_cursor.x;
      mouse_pos.y = mouse_cursor.y;
      wait (1); 		      
   }
}

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I had to flip the image to work around the bug.