Hi "peval",
This is an interesting post. It's really good that you've detailed your findings and I'm glad you are now seeing better video performance with 5.3 than 5.2.
As you've seen, a workaround is needed for the flash optimization part if you don't use VCS brokered connections. We can't apply pool parameters for flash optimization in the case of VCS not being used because we usually won't have a pool from which to obtain flash optimization settings. What will be possible in a future version is to allow the application of specific flash optimization settings to be managed via AD GPOs or direct reg settings. These can then apply in all cases regardless of the brokering technology used.
Mark