The first one I get – automatic switching between the two formats is a brand-new experimental feature so it isn’t a great case for retroactively changing the most important method wording right now, but I can see how that could lead to the expectation it wouldn’t work (though the feature was added because many people expected it to work that way, and were surprised that it wasn’t possible to switch from ARPA language models to JSGF grammars in the same session by calling changeLanguageModel etc).
The second point I don’t follow. generateGrammarFromDictionary generates a grammar from a dictionary. Can you elaborate on what is confusing about its name?