Jeff - thanks for covering this! Definitely didn't expect to see this on WP Tavern when browsing Feedly this morning :).

As far as the grammatical rules are concerned, when I have the chance to refactor some of the code for the next iteration of the plugin, I'm hoping to make it easier for other developers to include their rulesets for capitalizations.

That way, regardless of the type of English that you use, you'll be able to use the plugin.