well i know in a6 you could just use my.facing=off;my.oriented=on; but i dont know if a7 is the same or not
Looking at the manual, Oriented and Facing are old C-Script coding. Try this:
action sprite()
{
set(my,DECAL);
}
According to the manual, the DECAL flag allows you to orient a sprite via pan, tilt, roll.
Be sure to attach the action to the sprite.