AI aircraft behavioural issues

I have recently installed World of AI, and am very pleased with the way this has livened up my airports and made them more realistic. However I have come across some strange behavioural issues:

1. A few days ago I was taxiing behind a queue of aircraft to take off from London Gatwick. For some reason the first aircraft lined up on the runway but didn't take off. The aircraft behind it also lined up, but didn't take off either. I soon had around 4-5 aircraft all superimposed on top of each other lined up on the runway, but none would take off. So I had to turn my aircraft around and line up via a taxiway further down the runway so that I could take off.

2. Yesterday I installed the special bgl file that Fly Tampa have produced to allow World of AI to work at the old Kai Tak. I use the 9 Dragons version instead of Fly Tampa, and the bgl works great. However I suddenly saw 6 aircraft approaching on the Rwy 13 IGS approach with virtually no horizontal separation - it was like a flock of birds all flying together! The first aircraft landed, but the other 5 behind it had to go around.

Is there anything I can tweak to remove these issues, or is it just a quirk with AI that I will have to put up with?

And finally, is there any way I can stop the AI aircraft displaying the default FS liveries for the airliners? I want to keep the default liveries for GA aircraft, but seeing the odd default 737 livery amongst all the World of AI aircraft kind of detracts from the realism.

Thanks for your help.