The roughness issue is already logged in our system (Report ID=CMAX-1460)
For Corona AO and Curvature, please log a feature request here:
https://chaoscorona.ideas.aha.io/You will need to pick "Add a new idea" and describe your feature request in detail.
Regarding "translucency is not 1:1" can you share more of your setup? are you using Corona Physical or legacy mtl? Which version of Vantage and Corona you are using? Can you share a video showing this issue?
Regarding "hdri map to match Corona has to rotated 270deg inside Vantage.". This is now logged in our system also: (Report ID=CMAX-1664)