I'm sure you've all seen the drive through and stop and go penalty messages spam up the server chat. I'm wondering if it's possible to use some sort of app (LFSlapper maybe?) to block these messages.

You could try blanking the required strings for that

EDIT: Nope, that won't help, there needs to be at least one character, if not, a string from original english file will be used

Quote from Lible :

You could try blanking the required strings for that

EDIT: Nope, that won't help, there needs to be at least one character, if not, a string from original english file will be used

Blanking works, but not for all messages. You need to make sure that you also change the value in line tx_langname. And don't change original file, just make a copy of original, and then modify it... When entering LFS, choose new language.