First you have to be alive to be sued or convicted of anything. Once a person is competent in handling a firearm, then they should consider what, if any, modifications may help improve their performance. This could mean accessories or it could mean internal modification. My defensive guns have always been modified to some degree as it improves my performance and efficiency and makes me that much more likely to be able to save my life. While it's important not to do unnecessarily stupid stuff, living in fear of "what the court might do" could get people killed too. Just do what you have to do to run your gun as effectively as possible, and get a good lawyer if you ever have to.
Werd, think of what it takes to get to that point ... you gotta first survive, then you get tried by DA / Grand Jury, then you go to court. A legitimate shoot is so very unlikely to get to that point, and even more unlikely is that they'll use a trigger mod as the basis for their argument against you. Which brings us back to #1 ... you gotta survive first, and if that means you gotta take 8#s of trigger pull out of your DAO J-Frame to get good hits, then so be it.
In California, it's a different story. We have Castle Doctrine, lax weapons laws, common sense self-defense laws, etc. supported by as much as a hundred years of case law.