Let me throw this at you.
Player A: "Raise."
Player B: "I just ate a taco, and it was delicious."
Player A: "All-in."
Player A's action was not complete. Player B's statement was unrelated. The "All-in" was part of the initial action.
Player A: "Raise."
Player B: "Re-raise."
Player A: "All-in."
Player A's action was not complete. Player B's statement was out of turn, and therefore unrelated. The "All-in" can be read to be part of the initial action.
Am I holding him to that? Probably not. My point is that this can be interpreted a whole bunch of different ways, and figuring out which combination of rules applies, and which sort of nittery to follow, would just take a lot of time to sort out and probably wouldn't be helpful for the game as a whole.
Here's what I'm doing as TD:
"Okay, guys, I know poker's very exciting, but when you start acting out of turn, problems happen. Player A, we're still waiting for your declaration of your original raise. How much would you like to bet?"
And then go from there. They'll probably re-raise and go all-in anyway, so it won't be an issue. But if it comes to it, nothing else was binding. If either player feels like he was angle-shot, then that's just too bad, because both players made the same mistake. Hopefully lesson learned for next time.
One of the oldest rooms in the country (over 100 years), uses "no action out of turn is binding, ever" as the baseline rule. So far, fire hasn't rained from the sky. I think we'll be okay in a small home tourney.