Toggle Registration Button

Nextcloud Version:
31.0.2

Request Description:
In my use case, I like the Registration app a lot, but I want to send a registration link to people directly, not have the link publicly available for anyone to click.

Requested Solution:
The ability to simply toggle the Register button on the login screen off and on, and the ability to view the invitation link in the Registration app administration settings. I believe these features to have some level of versatility for several use cases other than my own.

Considered Alternatives:
I have already removed the Register button from my own login screen using the Custom CSS app with the following code. But not everybody knows CSS, and a simple toggle would be more ideal.
a[href*="apps/registration"] { display: none !important; }

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The request names the login screen and the Registration app administration settings, but no files or tests. Trace how the Register button and invitation link are exposed in those entry points, then verify that the button can be toggled and the invitation link can be viewed from administration settings.