Yes, we are working with it in a similar fashion as the antlr grammars... the generated files are committed to the git repository, so you only need to regenerate the files if you change the .proto file, and that will be rare, the same way that changing the grammars are a rare operation.
I haven't checked for a maven plugin, but there is a command line option that we can add as a task to a maven profile in the same way that we do for grammars. Didn't have the time to do it yet.
Edson
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Edson Tirelli
JBoss Drools Core Development
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www.jboss.com