Thought: Are we conceiving of Thalassocracy in game as *more* mercantile or militaristic (or neither)? The latter right? Its a Territory Civic and I understood Merchant Trade to represent its economic counterpart dimension. If we are agreed, would then a production rather than commerce bonus not be more appropriate? Even all that aside I can see interesting gameplay things happening, as commerce is relatively "cheap": easily acquired, augmented, available by several means, and to nearly any city site. Production, by contrast, is precious to the extent that for some cities can just, like, not have it. This goes especially for islands which, to a Sea Power State, serve as a primary lever of strategic power, and this would be better represented in the form of production. Also,. I only just noticed Whaling Boats are excluded. Intended?
EDIT: That's an easy enough mod for me to take so I'm gonna give it a few rips and report.