Mixing up commands from other sports is no big deal. I really get annoyed at the more off the wall ones though. It just sounds very unprofessional for a major match and has the potential for confusion by non-native speakers mentioned above. That's especially important for something billed as a world match. I'm not a fan of nod when you're ready, but I've learned to get along. It used to really bug me along with any time they SO waited for me to respond. I'll let you know if I'm not ready, otherwise drive on. I simply don't assume the start position until I'm ready. If it's just a standing start, I leave my hand on the gun until I'm ready to go.
I think proper commands really ought to be a/the goal for all of us.
I agree. But using different "lingo" doesn't make you a bad S.O. It doesn't hurt your score and the ones who complain the most about it...well...it could only help theirs If Robert Ray didn't say anything to Koski for his...then I am not worried about it. Get over it and shoot or nit pick about it and everyone will remember you on the range and wish you never came.