For information, you can use /ignore <player ID/name> to not see those players' messages.
Still, I don't want people ignored by me... If they want to tell us something, I can't hear them.There are tonnes of options to customize things to your liking with the features we already have.
For example, you could /w (whisper) or /pm (private message)
You could turn off the main chat and then only use the above commands.
You could make a gang and talk in gang chat (whilst still having main chat disabled).
Like my second point addressed, it would be tedious to alternate between toggling chat filter on & off. It's probably best that you can hear them on the off-chance that they need to talk to you or alert players of a cheaterStill, I don't want people ignored by me... If they want to tell us something, I can't hear them.