Yeah, the SS VAMO v2 does accept a T3, just don't screw it on too tight, or you'll have a mess when you take it off.
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No it shouldn't fire, in my opinion. I'm betting it's a firmware bug due to the branding. In the V2 there's a slight delay after hitting the button before it fires, maybe that's because I'm in power mode (watts) and it has to measure the resistance first, I'm not sure. What I think is happening is that they just inserted the branding code before the actual power off, and it's possible the V2 does fire slightly when fast clicking to turn off, only because it shuts off so fast after the fifth press, without logo delay time, it's not noticed.