Command restriction is already enough of a pill without needing to rewrite existing lines. I don't find manually invoked commands enough of an issue to warrant restricting them, when it ultimately lies on the command invoker. Bot spam is still spam; it's not the bot's fault. Such commands like .ca, .haah, .corrupt, etc. have remained without abuse.
The main issue is not keeping it housamo in #general.
It's been lax for ages, and even recently, we ("administration" (Roddo and I; ptown just helped put it into our brains that the server needs to change for the better)), keep trying to find an appropriate way to drill it into everyone to keep it housamo. It is nice when someone either lurking or even in on it steps back and notes the topic is not appropriate and should go somewhere else.
The problem with that 9/10 are backwards bad-words who tell you to fuck off because something like "rules are to be broken" or "it hasn't been an issue".
In short, the problem exists between keyboard and chair, not in the bot, It's been very very calm, nonaggressive, and not obnoxious now. While it may seem to be a bot issue, the underlying problem is the simplest rule.