Having read everything, I can sum up things and take proof off them. If they are wrong, a nice suggestion will do - don't flame me bro
Clacksman - Just to be sure. Those organised Tuscan races were through the same process we use here(eg XX.10) right?
general GTP side -
It's wrong to disconnect unknown users from what is essentially a public race
It goes against the sportsman spirit
Goes against the PSN user agreement
Non GTP_tag members who are clean racers will get booted
People will have to wait again and again to connect if more people do it and it spreads.
TeamGT side -
It's using their internet, so they can do what they want
PD lied to them

(oh - so that's a reason is it? Boy times have changed. When I were young......)
There are GTP_tag user names that are apparently not connected to, or drive with a driving style contradicting GTPs OLR rules
GT5P is not a proper simulator

(see above comment)
pretty much everything else that avoids reason
I'm not being biased (although it clearly looks as if I am

)
TeamGT - I haven't seen you do it, so I'm going to be polite. If there are cases where you purposefully disconnect unknown user ID's, it's pretty poor form if you ask me. Try if you will, to look at it from the other racer's side. I'd say 70%-80% don't give a monkey's if they get 5K more prize money and would much rather have a good race than being that little bit closer to the next car on the wish list. What you are essentially doing is stopping them from racing - because you have an event on.
In your local community, do you not have to get clearance from the community and local council before you start hosting street parties which close roads? What if you had an inpromtu urge to play football in the park? Do you have the right to order everyone else to stop having their picnics and go away just for you?
I suggest that you do away with this - and do what we do. Make a chatroom and if there are unknown people, send a message (it appears on screen) that tells every one to get out of the way and get back on the track to start 20secs after everyone else.
Oh, and
Dragonistic, I know you have no intention of booting people, but it's likely to happen if you quit the race to answer the phone.👍 May I suggest parking off track and pressing start? That way you also get prize money and the chance to get some driving time when you come back (albeit non competative)
EDITED: For reasons below(V)