Customized I/O buffering policy with Hermes Blobs control

Hi, I understand that we are able to give Hermes blob a score to hint at the blob's importance. Since a Hermes blob is great granularity for what a customized buffering policy can control, we would like to know if it is possible for Hermes to expose some mechanisms for controlling
1. where a blob should live in the tier
2. where a blob should go next (e.g. can we provide some control over expected RPCs/network messages?)

My understanding from the wiki is that operators like `MOVE(BufferID, TargetID)` and `COPY(BufferID, TargetID)` can control a blob's tier. And we would also like to control a blob's location with respect to compute nodes.