I know you've been asked this before and you've said it will take quiet a long time to make but, I would be willing to wait. I'd love to see a full route on the GWR, be it London-Bristol or London-Oxford because It gets a bit repetitive driving from Paddington to Reading and vice versa. Also I loved the realistic scenarios in the Journey mode for all the routes but I felt 5 wasn't enough. I would've liked to see more, I got through them pretty quickly. I in ideal world I'd love to be able to run the Paddington-Cardiff Central route as I travelled that route with First Great Western many times in the real world.
I would really like this to happen too. I posted a similar thread and all of your points are valid. We need to be patient though. Bristol's a long way and it will take at least a year(maybe more)for DTG to complete it. You never know they might be in the proccess of doing it now. I feel your pain, 5 senarios are just simple not enough.
