Also, the permission to enter can be implied if the supernatural beastie says, "Can I come in?" And you simply nod or step aside to grant them entry. That's like an implied explicitness (an oxymoron, I know!), but you know what I mean? Had the supernatural not asked, then the context would be different and it would not be an invitation.

As I mentioned, this is actually something that happens in the novels for the express purpose of NOT 'deactivating' the threshold for that individual.

It's good you've begun to reference them as 'The Laws of the Council'.  It is an important distinction from 'The Laws of Magic' which you seemed to have been referencing previously.
That clarification being in place, the corrections I would insist upon are minor enough that I no longer care to continue beyond this last restatement:

The Laws [of Magic] make a special case of a small set of actions.  We are not told why.  I do not care to guess.

(clarification added)

So you would argue that you could take a Power that functions similarly to Lawbreaker for other types of magic you might perform?

Or are you saying something more abstract?  I didn't really understand your post.

The Laws of physics are no less accurately termed Laws for their lack of a police force, trials, and executions.
The metaphysical laws represented by the Lawbreaker power are The Laws upon which the White Council of Wizardry based its Laws.

There is no Law for heating a cup of tea.  There is no Law for veiling a blade of grass on a lark.  There is no Law for transforming the caster's own self.
The Laws make a special case of a small set of actions.  We are not told why.  I do not care to guess.

Houserule as you will.

The rules imposed by the Council are boundaries on behaviour.  The rules imposed by the Council are not the only Laws.

There was a comment from the game designers a while back saying strongly implying that the intent was that you can do this.

In several instances, iirc, there are what would be reasonably strong 'implicit' invitations to an individual's home (Murphy's is the most common that I can recall: opening the door for an expected visitor, then stepping aside so as to allow them entry while neglecting to explicitly invite them through) that are nevertheless pointed out to not suffice to pass the threshold without effect (and are used in this manner specifically to weaken any supernatural threat the visitor might pose).
In Ghost Story, for instance, when Murphy meets with the WCV in her home.  (pretty sure that's not any meaningful spoiler;  I'll add tags if I'm asked to, though)


I think any unwholesomeness happening in the home would affect the threshold, or not, entirely independantly from association with a business.

Keep in mind the rather open definition of 'soul' for the purposes of the Dresdenverse when applying that rule.