It wouldn't be long before some berk started using PCL for starting his central heating or sending burst transmissions to a fax machine, so the bureaucratic mind just says, "No!".
I hardly think so, given the number of remote control options on the market already. Nobody is going to be clicking on some air frequency to control his central heating. And if he really wanted to, nobody could stop him; all he needs is an Icom radio and a simple decoder on the headset socket
I am sure the only reason PCL is banned here is because the CAA are too scared to do anything innovative in case there is some sort of comeback, no matter how highly theoretical. Their lawyers probably told them that if the un-ban it, and somebody crashes at night when the system packs up, the CAA will get sued.
This is of course bollox, but if you ask a lawyer (paid by the hour) if there is a liability his answer will nearly always be Yes, and the lawyers working for the CAA are all of the same character profile (a #1 Pozi screwdriver stuck up their sphincter would never fall out under gravity).
Exactly the same reason why Lyco won't amend their 1960s engine menagement writings to support LOP operation.