Hi,
Currently there are no log flags, mainly because the standard lib log doesn't support it. I'm thinking yet as to implement my own simple leveled logger or add an external dependency to the project. So yes, it is something I'm planning, just it's low priority for now.
About the node refusal, when you start up a node, you have to specify a private key for the whole cluster (-rsa flag). Only nodes having that same key will be able to join. Connecting nodes from different clusters (e.g. cross cloud or cross service) is currently under development and will be the next feature to hit release.
Also a planned feature is a status/statistics reporting service based on some web interface, but I want to finish the major features first to let them stabilize and work only afterwards on these extensions.
Cheers,
Peter