I have the lock on a Rossi Plinker. It's a different beast than the lock on the S&W revolvers I've had in the past, and I don't see how it's possible that it could engage under recoil like the S&W lock. Being located on the back of the hammer, recoil forces are acting in a different direction than the rotation of the lock, unlike S&W. Not saying it hasn't happened, but no amount of googling turns up any mention of a Taurus lock malfunctioning, and it's easy to find mentions of S&W lock issues.
If it really bothers you, I'd imagine you could just stake/peen the edge of the lock into the hammer and render it unable to turn. Buy a cheap punch at a hardware store, and you're done in one swing of a hammer. There's a
post on THR (warning:obnoxious ads) that says you can remove the hammer and drive out a small pin to remove the lock... but then you have a huge gaping entry point for crud that you need to deal with.
Personally, I'd leave it as is.