I got told that the S1 can lock two targets/or/and engage at 2 targets at once I have no idea how this works, I cant find anything on the Wiki for it.
As you can see I have to go one by one on the targets.
I haven’t had a need to do it since it first came out. You radar lock fire at 1 then use the visual with the other.
Step by step guide:
Lock something. 
Your radar will now scan in a zone.
Plane that you are not locking will enter the zone.
You press the 
It changes the target.
If you want to fire a missile on multipe targets:
First 3 steps the same.
Make sure your missiles are in auto mode.
Fire a missile.
Press the
button.
Fire another missile.
Now you are guiding the second missile, while the first one is flying by itself.
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It doesn’t work very well especially with manoeuvring targets but Pantsir is still better than Tor in this particular aspect, a lot better auto guide.