I'm no expert, before you ask
I'm not sure why it wasn't added by default, maybe ACE didn't see it as part of UTPure. And, while I think of it, isn't that some sort of cheat detection as well? If so, I hope it's disabled
And for your P.S. I would assume that nobody used the weapon that was kicked for the first time round. Again, I'm no expert but these would be my guesses.