Material ID should work if you set the ID from here. We have a note to make it work from the V-Ray material ID UI as well.
I agree that the edges in those render elements look better in Adv, when it is using the bucket image sampler (they are not really anti-aliased, since it will not be correct doing that, but they are not that fuzzy). The progressive image sampler in the Adv however renders them like in RT GPU. I am not sure if we will be able to fix that very soon, but I will make a note about it.
Thanks for the feedback again 
!
Best,
Blago.