One of the most annoying things I have to face is the bell sound when the password field is empty and I press backspace in
lightdm (using xfce). I’ve disabled it with the following line in
greeter-setup-script=xset b off
I want to make this part of the default install as I can’t think of any good reason why you would want such horrible sound to be accidentally played during login. The only way I can think of is having an overlay for that file here:
Downside is you have to overlay the entire file (afaik). Unless you can suggest a better way. I’m willing to do the work and provide the patches if you are OK with this.