I am looking for a way to import BRE generated policy with its vocabularies into BizTalk application from a command line (in order to script it) leveraging BtsTask command line tool.
I've searched around, and couldn't find a firm answer.
You can use the PowerShell provider for BizTalk. This allows you to script, amont other things, policy and vocabulary deployment.
This can provide an alternative to MSBuild which is more geared, in my opinion, to the development than to be used to support operations management.
The provider is available on CodePlex: http://psbiztalk.codeplex.com