As mentioned in another thread, we have not "licensed" anything since 1998. Conventions are now "permitted" {or not}.
Most of your questions have been answered. I would not dream of mentioning how Mike Amos found what he did but I doubt he would have if mobile phones {cellphones} had not been invented!
We do not feel we need a regulation that if not allowed it is disallowed. We have a list of permitted conventions and anything not on the list needs no further comment to be disallowed. So pass showing values is not permitted.
To play an artificial 1NT opening at one vulnerability but not another is to play two separate systems, only permitted at Level 4 in seven-board or longer stanzas.