Great to hear you're at least using OPVault :)
And also correct on the mini to extension protocol, there is no public documentation for that, primarily due to that being something we really need to be able to change as necessary.
We are really curious to see what you've come up with though :) So please keep me in the loop if possible!
Kyle
AgileBits
We've got pretty good OPVault support going, but your guys' RPC protocol is not open, right? Between mini and the browser plugins?