There is no way to currently add a new regex phrase while in game and I have no plans to add that functionality. I don't plan on adding it because while regular expressions aren't tough to figure out, it is *much* better to design your expression outside of the game and test it before ever putting it in the game. I know this from experience while creating this plugin.
I'm hardly ever set in my ways though. If you can convince me of an objectively strong benefit, I'd gladly reconsider.
The set of example phrases I provided are very effective for racist, homophobic, 'mygot' tags, and 'japs' tag, and 'player' names. Are there other sorts of names that you're finding that aren't being caught?