Is editing the config bannable?

@ayeeelmaaoThat will most certainly will land you a ban. It is never a good idea to alter game files and will result in a ban if you are changing mechanics out side of in-game options.

Using configs for getting better visibility could result in account action.

Recently somebody got banned for doing this.

CFG's could be used for performance related reasons, though even then, it's best to stick to the in-game options.